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one who has both lazy and retarded qualities.
Why don't you stop watching television and study alittle bit for once you bumbass.
by Brett Gasmony October 07, 2005
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A dumbass is a person who always mooches off others. Typically of the hemp persuasion. Signs: Quite possibly into the Grateful Dead / likes to talk about conspiracy theories.
Person 1: Hey man, did you know if you light your cigarette backwards its 7 years bad mental health? Tobacco industries planned that filter to be hazardous to your mental health. Can I bum a smoke?

Person 2: WTF are you talking about? And no, you can't have any of my cigarettes, you bumbass.

Person 1: Oh dude, harsh. Chomsky was fucking right!
by Exploding Faces July 15, 2010
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