Swamp ass

The term used for when your ass starts to sweat intensely. Swamp ass is a living nightmare. It makes your ass smell like you just sharted. It's gross, and is a reason to wipe your ass like you wipe your floors.

"Sat down with swamp ass for the entire day. Now every seat I sat on smells horrible."
"I feel you, man. I had a hot girl next to me once. Needless to say, swamp ass ruined everything."