dama blanca, n. — Green’s Dictionary of Slang

dama blanca n.

[Sp. dama blanca, white lady, i.e. white lady under white adj.; note cocaine is a ‘feminine’ drug, see girl n.²]

(drugs) cocaine.

2001		ONDCP Street Terms 7: Dama blanca (Spanish) — Cocaine.
2012		L. Berney Whiplash River [ebook] Baby Jesus watched his boys load the white lady, the dama blanca that had arrived on Monday. Very good product, the finest, from Peru. Or Bolivia.