The 5 Shocking Meanings Of 'The Fourth Hole' Internet Slang: Anatomy, Trends, And Taboos Explained

The term 'The Fourth Hole' has become one of the most confusing and widely debated pieces of internet slang, especially across platforms like X (formerly Twitter), Reddit, and OnlyFans. This phrase, which gained significant traction following a viral social media post in late 2023, is not a single, universally accepted anatomical feature but rather a collection of controversial and sometimes humorous euphemisms for various sexual acts or body parts. Understanding its context is crucial, as the meaning changes dramatically depending on who is using it and where the conversation is happening. This deep dive, updated for December 15, 2025, will clarify all the conflicting definitions.

The confusion surrounding the "fourth hole" stems from the common understanding of the primary three erogenous zones or orifices typically discussed in sexual contexts: the vagina, the anus, and the mouth. Once these three are accounted for, the "fourth" option becomes a point of contention, leading to a fascinating—and often explicit—array of interpretations that reflect current internet culture and sexual trends.

The Complete List of What is Considered 'The Fourth Hole'

The phrase "The Fourth Hole" has at least five distinct and often contradictory meanings circulating online. To achieve topical authority on this subject, it is essential to explore each one, noting its origin and prevalence in different online communities.

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1. The Anatomical Interpretation: The Urethra

For many who attempt to apply a strict anatomical logic, the most straightforward answer to "what is the fourth hole" is the urethra. The urethra is the duct that allows urine to pass from the bladder out of the body. In female anatomy, the urethral opening (meatus) is located just above the vaginal opening.

• The Logic: If the vagina, anus, and mouth are counted as the primary three orifices, the urethral opening is the next logical—though significantly smaller—hole in the general area of the reproductive and excretory systems.
• Slang Context: References to the urethra as the fourth hole usually imply a highly specific and often risky sexual practice. This interpretation is common on forums like Urban Dictionary and older Reddit threads.
• Relevant Entities: Urethral meatus, Bladder, Urinary Tract, Risky Sexual Practices, Anatomical Slang, Female Genitalia.

2. The Viral 2023 Trend: The Thigh/Butt Crease

The most recent and highly viral definition of "The Fourth Hole" emerged on social media in late 2023, particularly on X (Twitter), and is not an actual anatomical orifice. This definition is purely a phenomenon of body positivity and specific aesthetics.

This definition refers to a specific crease or fold of skin that can appear between the upper thigh and the lower part of a full, rounded buttock (a "Phat Bubble Butt") when a person is standing upright or in certain poses. The way the skin folds can create the illusion of a fourth, distinct "hole" or indentation.

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• The Logic: This is a non-anatomical, aesthetic-based interpretation. It became popular because it refers to a desirable body type that is often showcased by models and creators on platforms like OnlyFans and Instagram.
• Slang Context: This is the freshest and most prevalent meaning of the term today, often used in captions and discussions related to specific body shapes and "thicc" aesthetics.
• Relevant Entities: Thigh Crease, Bubble Butt, Body Aesthetics, Viral Slang, X (Twitter) Trends, OnlyFans Content Creators, September 2023 Post, Gluteal Muscles, Hip Dips.

3. The Male Partner's Anus: Pegging and The Fourth Point of Contact

A third, less common but widely accepted interpretation, particularly in discussions about sexual versatility, flips the script entirely. In this context, "The Fourth Hole" refers to the male partner's anus, used in the practice of pegging (anilingus or anal sex where the woman penetrates the man).

• The Logic: When a woman claims to engage in "all four holes," the fourth hole is understood to be the male partner's receptive anus, indicating a willingness to engage in anal play with her partner.
• Slang Context: This definition is a shorthand used to describe a high level of sexual adventurousness or openness to BDSM and role reversal dynamics. It is a term of empowerment and sexual freedom within certain communities.
• Relevant Entities: Pegging, Male Anus, Receptive Partner, Sexual Versatility, BDSM Dynamics, Anal Sex, Sexual Empowerment, Fourth Point of Contact (Military Slang parallel).

4. The Breasts: Titty-Fucking Slang

In a more obscure and older Urban Dictionary definition, "The Fourth Hole" is used as slang for a woman's breasts, specifically in the context of titty-fucking (intermammary sex).

• The Logic: The breasts, while not an orifice, can be used for sexual penetration, thereby being metaphorically counted as a "hole" or receptacle for sexual activity.
• Slang Context: This usage is less common in modern internet discourse but represents how the term can be applied to any non-traditional area of sexual focus. It is often used to describe a set of breasts that are deemed suitable for this specific act.
• Relevant Entities: Intermammary Sex, Titty-Fucking, Breasts, Euphemism, Obscure Slang, Sexual Acts.

5. The Comedic and Obscure Reference: Behind the Knee

In a nod to pop culture, one of the most humorous and least serious definitions comes from the animated sitcom *Family Guy*. The character Glenn Quagmire, known for his hyper-sexualized humor, once claimed that the fourth hole was located behind the left knee.

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• The Logic: This definition is entirely satirical and non-serious, intended to be a joke about Quagmire's outlandish sexual knowledge and to mock the concept of a mysterious "fourth hole."
• Slang Context: While not a serious sexual term, it is an important entity in the history of the phrase, often referenced by fans of the show or as a way to dismiss the entire debate.
• Relevant Entities: Glenn Quagmire, Family Guy, Popliteal Fossa (behind the knee anatomy), Satire, Animated Sitcom, Comedic Slang, Obscurity.

Why 'The Fourth Hole' Trended on OnlyFans and Social Media

The term's explosion in popularity in the latter half of 2023 and continuing into the present is a classic example of how ambiguous, suggestive, and curiosity-driven content goes viral. The confusion itself is the key to its success. Content creators, particularly those on platforms like OnlyFans, actively use the phrase to drive engagement.

When a creator mentions "The Fourth Hole," it immediately triggers curiosity and debate among followers: Is she talking about the anatomical urethra? Is she referencing the viral thigh crease? Is she implying a willingness to engage in pegging? This ambiguity forces users to comment, search, and share the content to find the answer, which in turn boosts the post's visibility across the algorithm.

The trend is a powerful marketing tool that leverages human nature's desire to uncover a secret or solve a mystery. It is a form of clickbait that leads to higher view counts, more shares, and ultimately, greater monetization for the creator.

Entities and Topical Authority: A Comprehensive Glossary

To fully grasp the context of "The Fourth Hole," one must be familiar with the various entities and concepts it touches upon. The controversy highlights a broader discussion around sexual anatomy, slang evolution, and digital content monetization.

Anatomical Entities:

• Vagina: The most commonly accepted "first" hole.
• Anus: The second hole, often referred to as the "back door."
• Mouth (Oral Cavity): The third hole, central to oral sex.
• Urethra (Urethral Meatus): The anatomical candidate for the fourth hole.
• Popliteal Fossa: The anatomical name for the area behind the knee (Quagmire's joke).
• Gluteal Crease: The general area of the buttock fold.

Slang and Sexual Practice Entities:

• Pegging: The sexual practice associated with the "male anus" definition.
• Titty-Fucking (Intermammary Sex): The practice associated with the "breasts" definition.
• BDSM: Broader community context for discussions on versatile sexual roles.
• Sexual Versatility: The term used to describe a willingness to engage in multiple acts.
• Euphemism: The linguistic device the term relies on.

Digital and Pop Culture Entities:

• OnlyFans: Primary platform driving the monetization and virality of the term.
• X (Twitter): The platform where the 2023 trend initially exploded.
• Reddit (r/NoStupidQuestions): A common forum for users seeking clarification on the term.
• Urban Dictionary: The repository for various, often conflicting, slang definitions.
• Family Guy: The source of the comedic, non-serious interpretation.
• September 2023: The specific time frame when the latest viral trend emerged.