Top Definition
When you munch on someone's butt then eats someone else therefore being a cheater!
Girl 1: Why did you break up with him?

Girl 2:Well we did it and he was a buttmuncher, but then his "business trip" was to be a buttmunchereatercheater.

Girl 1: :0
by pissed off exgirlfriend May 22, 2011
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