A colourful American idiomatic euphemism for anal sex, playing on the directional paradox of using an exit as an entry. The phrase is informal and deliberately roundabout, allowing the topic to be raised with a degree of jokey indirection. Typically used in casual conversation or comedy rather than explicitly sexual contexts.
The sketch got a big laugh when the character kept insisting he had no idea what going in the out door meant.
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(idiomatic, slang) To engage in anal sex.
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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.