The slang term for the clothing worn by an MMA-wannabe or "bad-ass" wannabe. Usually a cheap cotton t-shirt or jeans marked with screen-printed skulls, crosses, or other design typically associated with the "biking culture". Term is a combination off the term "asshole" and "Affliction", which was one of the popular clothing lines sporting these designs. Also a slang term for clothing that at one time was trendy, but has become too commonplace to be a true fashion statement.
That guy over there wearing the Assfliction shirt, yeah, the wannabe MMA tough guy who's too much of a pretty boy to have ever seen, much less been, in a fight.