Green’s Dictionary of Slang

(Scot. Und.) gold coins, money; also as adj., gold.

1756		W. Toldervy Hist. of the Two Orphans IV 65: I am the dog who has done this! and for what? for the sake of d----d destructive dross!
1821		D. Haggart Autobiog. 20: We observed a conish cove, who sported an elegant dross-scout, drag, and chats. [Ibid.] 35: I sunk into his keek cloy, and eased him of a skin, containing nineteen quids of dross.
1857		‘Ducange Anglicus’ Vulgar Tongue.