Definitions by mmbaby.

whackass 

when someone is whack, just a harsher version of it. comes from root word whack which means dumb or a word to define someone who is obviously exaggerating. can mean wrong. usually meant in a playful sense.

joe: i shot the president !!!

bob: man, you such a whackass.

whackass by mmbaby. May 26, 2009