A general insult , a bit like calling someone an idiot. However it can also be used to describe or insult somebody who thinks of everything as a business deal, or somebody who is just wealthy in general.
Tim: Harry keeps showing off about how expensive his PC is.
Will: Yeah, he has that big-ass house aswell.
Noun, Proper: adj. A creepy guy, usually identified by a third party, typically found in large crowds, who consistently gets caught staring at a person for an extended period of time.
I found Cornhead in the gym this afternoon, staring at the sweatybasketball players again.
"Stop giving her that cornhead stare man! It's creeping her out."