A shortened term for the American musician, Gnarls Barkley. He is know for musical styles like Funk and Contemporary R&B.
Fran: Dude I love Gnar Bar's shit!
Matt: Yea, I'd do him if I had the chance.
Fran: What did you just say?
Matt: Oh nothing.
the gnarliest of the gnarliest, best of the best, the most wicked thing you could ever see or do.
That shit is gnar bar!
Lets go out out and get some gnar bar ass!
That wave you got was gnar bar bro!