Green’s Dictionary of Slang

shitskin adj.

[shit-skin n.]

(US black) a derog. term meaning pertaining to black people.

[US]C. Himes Cotton Comes to Harlem (1967) 176: ‘These shit-skin sandals are too big,’ she complained.
[US]R. Price Clockers 255: I think he’s a motherfucking dope-dealing shit-skin cocksucker.