Green’s Dictionary of Slang

lampblack n.

[? lam v.1 (1); thus the bruises make one’s skin even darker, or SE lampblack, carbon residue, often used for blacking up]

(US black) a very dark-skinned black person.

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[US]Z.N. Hurston ‘Story in Harlem Sl.’ in Novels and Stories (1995) 1003: Who playing de dozens? You trying to get your hips up on your shoulders ’cause I said you was with a beat broad. One of them lam blacks.