1. a. A bonehead-like person, or seemingly cool person acting in a bonehead manner. Typically found at a party, social gathering or event, where an audience is present, surrounded by a layer of bigger teeth.
b. A similar person, acting in tooth-like manner. Someone who simply is not cool.
2. A "cock-blocker."
Word History: from the root, rocktooth, or toothface -- a derivative of rockface.
"Why were there so many teeth at Colin's last night?"
"Domingo was being such a tooth."