Slang for sexual intercourse, used euphemistically and often humorously — particularly in British English. The phrase captures the mechanical repetition of the act in the bluntest, most reductive terms. It is typically deployed for comic or dismissive effect rather than as serious description. Made famous in English-language culture by A Clockwork Orange ('in-out, in-out').
He wasn't interested in anything serious — just the in-out and then he was gone.
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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.
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(slang) sexual intercourse.
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