Green’s Dictionary of Slang

1. a derog. term for a black person [= coon n. (4)].

1998		I. Welsh Filth 18: Someone daft enough to top a silvery in the centre ay the toon.
2001		D. Looser Boobslang [U. Canterbury D.Phil. thesis] 167/1: silvery moon n. a person with dark skin.

2. (US) a spoon.

1955

Index Jrnl (Greenwood, SC) 29 Nov. 5/4: Silvery Moon — sppon.

3. (Aus.) a pimp [= hoon n. (1)].

1983

R. Aven-Bray Ridgey-Didge Oz Jack Lang 7: She was thinking of her lazy silvery moon, the ducks and geese, and the cost for the use of the drum in the cracker joint she operated from.