Slang for a condom. 'Jimmy' functions here as a euphemism for penis, making the construction transparent. Used in casual, often humorous American English registers. Part of a long tradition of indirect slang terms for contraception designed to talk about the subject without stating it directly.
He fumbled in his wallet looking for a jimmy cap.
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(slang) A condom.
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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.