Green’s Dictionary of Slang

booner n.1

also boonie
[boon coon n. + ? overtones of boondocks n., i.e. rural stupidity]

(US) a black person.

R. Crumb in Estren Hist. of Underground Comics (c.1974) 6: This one we got at a Black Panther meeting [...] I bet those booners just loved her.
[US]R. Price Blood Brothers 194: They take some boonie after he works all day at Nedick’s and they make him take a bath.