it's another word for crunk.
"How many did he have last night?"
"I can't remember, 47? I was grounced too."
A term used to describe a male who is obesssed with himself and thinks he is better than everyone else. He is usually white trash, ugly, and fat. Also tends to have a small penis.
Damn, I just got hit on by a Gary Dunbar. Wish he would go back to his trailer park.