"Black people time" is a measurement of time used to describe the difference of black peoples' perception of time with respect to everyone else's perception of time.
"It is 12:15...didn't Tyrone say he was going to meet us here for lunch at this time?"
"Yeah, but he is on black people time (bpt), so it will be another 45 minutes to 2 hours..."
"What a dick!"
Also know as BPT, is the mean solar time at which the average black person arrives, adopted as the standard time in a zone that includes all African Americans. BPT delays usually run from 15-45 minutes.