Everyone's right: George W. Bush is a complete, 100%, genuine, Grade-A Dumb-Ass!!
He's the perfect example!! No better definition than that!!!
I've never seen a bigger Dumb-Ass than our very own President George W. "Dumb-Ass" Bush!!
If you voted for him, shame on you!!
well seing as an ass is a word for donkey,i would think that a dumb-ass means a person who is as dumb (or looks like one)as a donkey.Basicly it is an insult of saying someone is dumb or stupid or even a jack ass.