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Someone who makes senseless choices and ruins everything.
ex. George Bush
51% is not a mandate, George W Bush is a dumbass.
by Lisa K March 09, 2005

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someone whose ass does not speak.
They are very refined and unable to pass gas.
Queen elizabeth II is a dumbass
by ass face October 27, 2003

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Characterized by being obsessed with dungeons and Dragons, such as the person that submitted the definition for Wyvern
Damn it! My comp shut down for a half hour! Now I can't play Dungeons and Dragons :'(

You're such a dumbass
by Wyvernz October 17, 2006

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1. A person who think Bush is a good president
2. People who name their children after objects (tree/sunflower/cinnamon/house/etc.)
Look at this dumbass he thinks Bush is amazing

What kind of dumbass would name their child cinnamon!?
by LAN_Wee October 04, 2005

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simple, a guy with shit for brains
James is a dumbass because he is a stoner
by james marcum June 18, 2004

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Anyone who spends all their money at strip clubs because they are to stupid to get a date and they are still living with their parents at 25 being told what to do all the time because they have an IQ of 50 and don't have enough money to move out because they can't hold onto a job without getting fired.
Chris is so retarded! He can't talk to women because he is stupid so he spends all his money at strip clubs. What a dumbass!
by Freedy Martins October 26, 2009

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"Dumbass" is a redundant term. An "ass" is a fool and "dumb," of course, means stupid. Hence, "dumbass" means "stupid fool." Is not it more efficient simply to call someone ans "ass?"
by Paul Thundergod June 26, 2003

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Someone who constantly brakes things and acts like an idiot and never listens no matter how many times you tell them something. Usually thinking they are funny, dumbasses usually do incredibly stupid things. If you are doing things like tripping over curbs or driving 50 km down a road with your turn signal on you just might be a dumbass.
Wow look at that kid tripping over the curb what a dumbass!
by papaloki July 31, 2006

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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