According to FUNKTIONARY:

Black-on-Black Crime – a psycho-political euphemism, unwittingly used and abused by African-Americans and deliberately by Caucasians, describing demographic criminal activity in general, as people overwhelmingly commit violent crimes on people who live in closest proximity to them, and the violence mostly occurs by those and on those who are held hostage under chronic and cyclical economically disadvantaged circumstances and environments. Do you ever hear of the slogan “White-on-White” crime? Most violent crimes (at least by number, if not also by percentage of population) take place by Caucasians against Caucasians. Where’s the associated terminology? The pathological criminality within Black neighborhoods is maintained by the ones “keepin’ it real”—that is, real quick to murder people who look like themselves. (See: Gangbanking, Pan-Africanism & Racism)