When your your ass begins spontaneously sweating, unrelated to heat or exercise. The crack is especially affected.
Mighty fuck, I have the ass sweats, my underwear has reached it's saturation point.
by Lethargic Lad November 22, 2003
Heavy sweat originating between the ass cheeks.
Look at his pants! He has some major ass sweat happening.
by The Slater November 04, 2003