(noun) abbreviation of jail bait, in other words, an underage individual legally considered not yet an adult in his or her local jurisdiction.
He was roleplaying with this gal who swore she was 21 and totally legal but when they switched on the webcams, it turned out the gal was jait. He erased the logs and browser history in a cold panic lest the party van come for him.
by coyotama November 29, 2010