1 definition by Chris And Libby

Top Definition
Like a cream pie, except the woman is not on any birth control, so the cream pie turns into a birthday cake, ie: she gets pregnant.
Man: Oh man, i came in my girlfriend last night, and shes not on the pill!
Friend: Oh Dude! You gave her a birthday cake!
by Chris And Libby February 18, 2009
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Buy a Birthday Cake mug!