a random kid you meet online in a video game, usually halo, call of duty, battlefield, or gears of war. they think they are the best players ever, but actually suck.
This kid just picked up the boomshot and killed himself, what a dumbass random.
A founding father of any given field who was terribly incorrect, but is worshipped nonetheless.
Freud is the Daddy Dumbass of psychology.
When someone is so dummy thicc, they enter a new realm of thicc.
Damn, dude, that chick is dumbass thicc!
The consummate dullard, surpassing Alexander and lesser Dumbasses.
Then the contestant, reacting to the audience's laughter after she identified the author of The Three Musketeers as "Alexander Dumbass", said, "No...wait... Henry Dumbass!" -- from the Pardon My Blooper album, 1957.
When you got nothing but chill and smoke
Roll up a blunt bruh I am dumbass bored
An Urban Dumbass is a staff member at urbandictionary.com who cancels your submission before it even reaches the editors. This person is often a huge douchebag who rejects your defenition just because his dumbass doesn't understand It. He will let completely lame trash pass as a definition, just because he understands the It, yet he'll cancel good and useful defenitions that don't break the rules.
Note: The Urban Dumbass should not be mistaken for the Urban dick
Guy 1: Hey did the definition get passed, man?
Guy 2: No, the Urban Dumbass rejected It cuz he didn't understand It.