A comedic British slang term for the penis, relying on the absurdist imagery of combining a dessert topping with military hardware. This is firmly in the tradition of silly, juvenile British euphemisms that achieve their effect through sheer ridiculousness rather than aggression. It's the kind of phrase that turns up in schoolyard banter, crude comedy, and any context where someone prefers a laugh over a clinical term.
The comedy sketch about anatomy lessons had the audience in tears the moment the teacher said custard cannon.
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(slang) 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.