1999; imitative of the sound of a male masturbating, coined by an artist whose pen name is Clay on his webcomic The Thin H Line, H referring to hentai (pornographic Japanese anime);
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The Slang Term (Most Common)On the internet, “fap” is an onomatopoeic slang term for male masturbation. It originated from a 1990s webcomic to represent the sound of the act and is often repeated (e.g., “fap, fap, fap”) in online forums like 4chan, Reddit, or TikTok.
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The Medical ConditionIn a medical context, FAP stands for Familial Adenomatous Polyposis. It is a rare, inherited genetic condition where hundreds to thousands of precancerous growths (polyps) form in the large intestine (colon). If left untreated, the lifetime risk of these polyps developing into colorectal cancer is nearly 100%. You can learn more about its symptoms and treatment at Mayo Clinic.