When something is behaving inexplicably and unpredictably.
Eric, I'm tired of working on this whackass code.
by gdus May 17, 2011
Sucky, Stupid, things out of the ordinary. Ugly.
1. Damn, thats some whack ass hair.

2. Wow, this is a whack ass definition!
by punkrockpat10 April 18, 2010
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.
by mmbaby. May 26, 2009

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