When you do something to piss someone off
Yea he ate my burger, he's a Jackass!!!
Jackass - A man whoms't has been left with their anal cavity exploded in, and has proceeded to wonder around without flushing it out
HEY!! There's one of those slutty town drinkers. I bet she has a whopping jackass
This may mean a stubborn idiot, who is also extremely handsome and/or a joker
Man, you know Sam?
Yeah, he's a real jackass.
A jack ass baby butt that sucks up to all his teachers
Dude, he is such a caleb jackass baby butt