British colloquial euphemism for the penis, typically used with self-deprecating or lightly comedic tone. In standard usage 'old chap' is a friendly address term for a man, which makes its anatomical extension a piece of classic British double-entendre humor -- the kind that depends entirely on context and delivery. The register is humorous and slightly self-deprecating rather than coarsely vulgar or aggressive.
He mentioned the cold weather had not been kind to the old chap, which got a laugh from everyone.
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In British slang, old chap is a euphemism for the penis — mild, slightly comic, and thoroughly English in its preference for understatement. Old chap more commonly functions as a friendly address (steady on, old chap), and the genital meaning rides on that same tone of breezy, gentlemanly casualness. It's the kind of euphemism that makes awkward conversations slightly less awkward.
He winced and said he'd taken a football straight to the old chap.
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(UK, colloquial) The penis.
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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.