Green’s Dictionary of Slang

(US black) black.

1967		R. Conot Rivers of Blood 283: They were all out there jiving [...] tonight it didn't make any difference what you were, so long as you were blood.
1970		G. Scott-Heron Vulture (1996) 111: All the P.R. and blood women had been running up and down [...] and traipsing off with bundles of shit.
1990		S. Morgan Homeboy 18: As one the blood pack swung out, dipping and sliding down the sidewalk.