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when a flap of skin hangs out the arm of your shirt resembling a butt. mostly found on a fat person with a small shirt
did you see that buttpit hanging out of that lady's shirt?
by funnystuff1708 September 03, 2010
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When your pits or someone else's pits smell like a butt. Particularly nasty B.O.
Alex: Did you get a whiff of Josh's buttpits in the locker room after?

Shaun: No, but I can just imagine the stink.
by Marziba July 24, 2011
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