(n.) A grossly or overly hairy ass; an ass that is completely covered with hair, thus covering any skin and only showing the thick mat of hair grown on top; a hairy ass which causes excess sweating
A sweater a woman ties around her waist to hide her ass while jogging, walking or exercising. While most of these women have good figures from their exercise, they are likely self-conscious of others staring at their ass.
Not to be confused with Swamp Ass, Sweat Ass occurs when someone forces a sweaty state of the ass. Similar to Swamp Ass, if not treated, Sweat Ass can lead to a more serious condition called duck butter.
Johnny was riding down the road when he noticed that Trent had turned on his heated leather seats. His ass was dripping with sweat. "Thanks for the sweat ass," he told Trent.