Green’s Dictionary of Slang

a person of mixed race.

1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Dingey Christian, a mulato, or any who has, as the West Indian term is, a lick of the tar brush, that is, some negroe blood in them.
1811		Lex. Balatronicum.
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue.