Green’s Dictionary of Slang

(US black) white.

1978		J. Webb Fields of Fire (1980) 212: You better not go, Baggder. He don’t want to see any Chuck dudes.
1990		(con. c.1970) G. Hasford Phantom Blooper 188: A dustoff dee-dee’d friendly Whiskey India Alphas to Charlie Med, most ricky-tick. Them chuck squid pecker-checkers were number one.