A crossover is that type of person who once belonged to a distinct subculture who then suddenly changes their style and behaviour to another subculture, usually coming from a change in fashion trends.
Person 1: "Hey, check him out, he doesn't know what group he's part of!"
Person 2: "He's such a crossover."
Person 2: "He's such a crossover."
by MRTG July 28, 2011