A phrase specifically used to classify none black girls that have a preference to get with or fuck black guys. Girls that are DTB typically are groupies that hang out at parties that consist of alot of black athletes (football/basketball parties), have majority friends that are black, have large ass's, dress like a black girl, etc.
Guy1 to Guy 2: dtb?
Guy2: sure, gimme a min.
Guy2 to Guy3: hey man me and a few others are dtb, u in?
Guy3: Fuck yeah, lez bang!