1 definition by FlockaFlocka12
the traffic caused by a group of African Americans blocking the hall and preventing Caucasian students from moving to their next class.
Tom: Dude, why arent we moving?????
Andrew: Man this is the Math hall. This is probably the black-up from all those black guys who walk slowly.
Andrew: Man this is the Math hall. This is probably the black-up from all those black guys who walk slowly.
by FlockaFlocka12 February 3, 2011