Top Definition
While a male and a female are having anal sex, the male, after shooting his load into the female's asshole, will pour a small amount of alcohol into her anus. The female will then let loose a monstrous fart - the resulting bubblish liquid will resemble a fribble.
So I was giving your mother a Boston Fribble last night and I almost drank that shit.
by Vladimir Putin the Third May 08, 2008

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