1. - Mode of dress: Leaving the pants to hang so low as to expose the underwear and/or buttcrack.
2. - Taking a half-assed or lazy approach to a situation, job or responsibility. Proposing a solution to a problem that is outside the normally accepted methods.
1. - Dude, you can't go to the senior prom dressed like that! Everybody is going to be in a suit and tie. It's supposed to be semi-formal, not nigger-casual!
2. - Man, why do you keep parking your car in the handicapped spot? That is so nigger casual.