A guy who is not in a fraternity (however has the potential of being in one) but has the character traits of a stereotypical frat boy. This includes drinking, partying, being a douche, and trying to get laid. Frat asses can also be fraternity boys who are only in the fraternity for those specific reasons.
Brian has turned into such a frat ass...he's not even in a fraternity!
by Uranus101 November 01, 2010
A dumbass who thinks it's okay to do drugs, get STDs, and shoot (literally or metaphorically) other people in the face. He doesn't nesscessarily have to be in a fraternity, he just has to show stereotypical frat boy douche bag qualities.
21 Jump Street is funny and all, but let's face it. It's basically a frat ass' wet dream.
by A-person_yay June 21, 2014