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When a white girl and a person of color(or the other way around) have anal intercourse.

Comes from the Reese's Peanut Buttercup commercials. "Your chocolate is in my peanut butter. No your peanut butter is in my chocolate."
I was hooking up with Angela when she asked me if I wanted to Peanut Buttercup.
by Phillip Pino August 04, 2010
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Peanut butter cup = fucking a constipated chick up the ass, getting your dick nice and chocolaty, putting some PB on it, then having them lick it off.
My girlfriend was a little bloated, so I helped her out with a Peanut butter cup!
by ICTimmy June 01, 2017
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When a guy takes his dick and sticks it into jar or peanut butter puts the peanut butter back into the cupboard. Then sticks his dick in the girls pooper. Then the girl licks off everything!
"hey baby want to do the peanut butter cup tonight"
"you know how hard that would be to get the peanut butter out of my ass"
by MetalPheonix December 13, 2007
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When a man's fucking a girl in the ass and she shits on his dick. At the time he pulls out she puts peanut butter in her mouth and sucks his dick aka peanut butter cup!
Steven: "I got Tiffany to do the peanut butter cup last night."
Lee: "that's gross but you're legendary"
Steven: "her mouth was filled with peanut butter and " chocolate ".
Lee" Peanut butter cup!"
by Butt Truffle. October 27, 2017
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