Someone who is a skid mark on society, dumb and incoherent. Usually when drunk does the real perpetrator of this crime come out.
Nate, " Man was koltfucked up tonight."
Mike " Yeah he was acting like a real ass stain."
By Karry
Ass Stain
doesn't exist, if you mean "shit stain" or "turd/poop stain" it makes sense but your ass physically does not stain, if you use this word you're a moron.