Taint stank
The rancid body odor that emits from a man's taint (the area between the ball sack and the asshole) usually after sweating or exerting some sort of effort.
DUDE1: "Dude, after doing that workout I've got some EPIC taint stank."
DUDE2: "Yeah, dude, I know... I can smell it from here."
DUDE2: "Yeah, dude, I know... I can smell it from here."