A slang term usually used to describe how amazingly misaligned ones teeth are, but can also refer to a smashed set of teeth from the aftermath of a facial beating. Often used as a "ghetto" term but can also be used by white teenagers who think its pretty hilarious.
Clark: You got some ill jibbs there Derek, you should prolly get some braces or somethin.
Rob: Dude Pete just got punched repeatedly in the face until he agreed to sing "See You Again" by Miley Cyrus in front of the entire class.
Bob: I bet he has some ill jibbs after that beating!