Green’s Dictionary of Slang

(US) a black person.

1967		P. Thomas Down These Mean Streets (1970) 82: I mean a lotta Latinos, Moms. Like here in the Barrio. And how about morenos?
1995		(con. 1985–90) P. Bourjois In Search of Respect 108: Yo Caesar, who were those two morenos? I didn’t even know the motherfuckers.