Green’s Dictionary of Slang

(US black) a nickname for a light-complexioned person.

1984

A. Sample (con. mid-1930s-early 1940s) Racehoss 55: [S]he never said more than a few words to me, ‘How you Whitefolks? Boy, you sho is growin,’ or ‘Emma, Whitefolks’ hair ain’ gittin a bit darker!’.