n. The wannabe-black pimp Drexl's (played by Gary Oldman) idea of a holiday where crazy white men can assualt pimps in their place of buisness and get away with it. For Christian Slater, it obviously wasn't White-Boy Day.
Drexl Spivey: "He must have thought it was white boy day. It ain't white boy day, is it?"
Marty: "No man, It ain't white boy day."