DeLaSalle bro zone is very popular T-shirt for the student who go to school's game and wear that T-shirt to cheer for school, so what is bro zone mean ? the "bro-zone" can be defined as an area in which a girl has entered when befriending a guy. Usually occurring with tomboys and their guy friends, when the male friend acknowledges the girl's actions (assuming that the girl is a tomboy) refers to her as a "bro" or "another one of the guys". At this point the girl in question has entered the bro-zone. The bro-zone eliminates any possible chance of the friends having any sexual or relationship interest, and renders any chance of escaping the bro-zone hopeless.