Crude internet-born slang meaning to masturbate, primarily used by guys in online spaces. 'Fap' is an onomatopoeic word that emerged from anime and internet communities in the early 2000s before spreading into mainstream internet slang. 'Fap it' is the verb form — telling someone to go do it, or describing the act. It's casual and crass, carrying no particular shame in the communities where it's used, though it remains distinctly informal and NSFW.
His roommate burst in at the worst possible moment while he was trying to fap it in peace.
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(vulgar, slang) To masturbate.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.