Idiom Breakdown

buff the muffin

SLANG Masturbation

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Definition

To masturbate.

history_edu

buff (“to rub”) + the + muffin (“vagina”), chosen for the rhyme in the participle ("buffin' the muffin").

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"1999, Ericka, in alt.jokes.limericks http://groups.google.com/group/alt.jokes.limericks/msg/6a31a3b704183489?dmode=source Dear Peter, I need your stuffin' Your bod, your rod, and handcuffin' While I wait for your ans- wer, I'll take off my pants, And start in on buffin' the muffin!"
"2003, Paul Austin, in alt.peeves http://groups.google.com/group/alt.peeves/msg/37b92cd0a72eaed4?dmode=source "Dear Miss Manners, myself and my three girlfriends are playing buff the muffin this weekend and we'd like to know who's supposed to peel and slice the cucumbers for salad afterwards?""
"2004, Christopher Moore, The Stupidest Angel http://books.google.com/books?ie=UTF-8&hl=en&vid=ISBN0060590254&id=QNM4japF5g4C&pg=PA151&lpg=PA151&sig=kUORuHRpFvwKNOWpC8pTnEBlLqo “Molly?” Lena said. “You sound out of breath. Are you okay?” … “Oh, yeah, I’m fine, Lena. Just buffing the muffin. …”"