Aunt Nora, n. — Green’s Dictionary of Slang

Aunt Nora n.

[ety. unknown; ? N of Nora and ne of cocaine; note that cocaine is a ‘feminine drug’, see girl n.² (1)]

(drugs) cocaine.

1959		J.E. Schmidt Narcotics Lingo and Lore 8: Aunt Nora – A narcotic in powdered form.
2001		ONDCP Street Terms 2: Aunt Nora — Cocaine.