Top Definition
when you are having anal sex with a girl, ejaculate in her, and then she farts it back on your face!!!
Bro 1 "So is Tara coming over tonight?"

Bro 2 " Hell no, I want nothing to do with that!"

Bro 1 "I thought you two hit it off"

Bro 2 "Everything was great at first, but then she hit me with a Butternut Bomb! I'm out!!!'
by chokingrandy November 28, 2011

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