Someone who thinks that they are cool and/or smart but really isn't.
Someone who is dumb,annoying or lame.
Dude 1: Two plus two is four!
Dude 2: Wow, you are such a jackace!
Guy 1: That was awesome! (After doing a stunt badly, not realizing it)
Guy 2: Shut up jackace! You did it all wrong!
Guy 1: No I didn't!
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