The area of perspiration on an individual's pants/shorts in the butt-crackal or taintal region made visible to the eyes of the surrounding audience; most commonly associated (but not necessarily) with strenuous activities - such as working out.
Hey dude. . . before we go out in public, you gotta do something about that gnarly fitness stain you have goin' on down there! Does that not bother you?
by Stupidjerkheadface June 17, 2016
Get the fitness stainmug. by Brookeisdumb November 6, 2018
Get the carpet stainmug. by McSpleeny June 2, 2018
Get the Daniel Stainmug. You use this term when you think someone is cheating {Preferably a female.}
It's also used as another term for oral sex. {Preferred for females.}
It's also used as another term for oral sex. {Preferred for females.}
by Blesarus May 15, 2018
Get the Lipstick Stainmug. When a woman old enough to be considered a cougar leaves a pussy juice stain on your nuts,sheets,couch,or in your beard.
by milly butter May 12, 2015
Get the cougar stainmug. Glenn: *farts so loud he sounds like he shit himself*
Me: oh my god Glenn. Did you shit yourself?
Glenn: no I don’t leave curb stains
Me: oh my god Glenn. Did you shit yourself?
Glenn: no I don’t leave curb stains
by Disgustingglenn March 22, 2020
Get the curb stainmug. A mark rarely found on the face of young children whom measure their height with shoes on and resemble a dried up noodle. The shit stain is a mark of Satan and over time it can cause the sufferer to grow extra chromosomes
by Dankmememasterpapi69 May 27, 2018
Get the Shit stainmug.