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1.) the result of sitting on the wrong park bench at the wrong time.

2.) a giant female rump covererd in a thick layer of cellulite.
I ate lunch in the park and got gum butt.

Trisha needs to tighten up that post-lipo gum butt.
by Stabson June 29, 2009
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The diarrhea and farts produced from chewing too much sugar free gum.
Man, you chewed that whole pack of Extra in 10 minutes. Dude you're gonna get gumbutt!
by climage September 08, 2011
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