Persipation of the most seldom occurance, in which one's ass sweats, not from heat or activity, but rather from the anticipation of a catastrophic dooley (poop) that is forthcoming. In addition, said sweat emits an odor characteristic of that same foul dooley. (Note: NOT synonomous with butt sweat, swamp ass, etc.)
"Jesus Christ, Pat, what's that smell?"
"Man, I gotta deuce. That's my poop sweat you're smelling."
A stagnant odor best described as being half poop and half sweat. Most commonly found in the carpet and furniture left by previous renters in apartments. Scientifically proven to be 6 billion times stronger than Febreze so don't even try.
Dude, that couch smells like freaking poopsweat so don't put your face near it.