Someone who looks really bad. In reference to the TriBeCa area of New York City where all the artsy people hang out and live. They dont dress very well, or arent in fashion, so they are TRIBECA!!!!! Usually screamed at the unsuspecting, or mentioned among friends about others.
OH MY GOD BECKY, look at that Tribeca over there. What the fuck was she thinking when she got dressed this morning.
TRIBECCA!!! (screamed at someone dressed really bad)