Top definition
The act in which two participants sit on all fours, butt-to-butt and the first, "penetrating" partner poops into the second, "receiving" partner's anus, the second partner then returns the poop to the first in the same fashion and this is repeated again and again and again...
Dude, you wanna go upstairs and poop in and out?

No way man, we'd have to put plastic down and everything, let's do it outside.

Okay, I know the perfect place...
by In and out June 07, 2009
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