Top definition
Literal: Someone who still has poop of their buttocks after a bowel movement.

As an insult: Someone who is being mean.
I went to the bathroom. and there is poop in the toilet but no toilet paper. Emily definitely has a poopy-buttocks today.

Bob called me stupid. He's such a poopy-buttocks.
by NewYorkGiants3 May 08, 2011
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