A sexual act when the girl puts peanut butter all over the guys penis and asshole and then licks it off. Can also be preformed with other foods such as whip cream, chocolate, etc.
Yo dawg that hoe over there gave me a peanut butter schfinkter last night!!!

Dude did that bitch give you a peanut butter schfinkter?!?!
by Jlevitt95 March 18, 2010

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