A person that appears to be cool, but not that bright or smart.
Joe is a nice guy. he is hip, but you ask him one question about something complex, he doesn't understand. He's Def and Dumb.
The hottest and D A N K E S T person ever.
I wanna be a big dumb lanky idiot.
Another way to say dumbass or really bad
John: Hey what's today?
Nathan: It's Tuesday you dumb beat.
John: Ok Jackass
the dumbest most battiest bitch in town!
this dumb ass bitch is a motherfucking baddie