1.a person who does something stupid.
2.a pet name for your stupid buddies.
4.a person who does not know the meaning of dumbass.
1. guy 1: that dumbass jumped off the cliff.
guy 2: well, at least he's not a pussy.
guy 1: you're a pussy.
2. how the hell are ya, dumbass?!
3. by sitting and reading this, you have confirmed you are a dumbass.