oreo · noun1
Genericized use of Oreo, q.v.
Oreo · noun2
Brand name of unknown origin, trademarked by National Biscuit Company on 14 March 1912. See the Etymology section of Wikipedia's Oreo article for various theories. In reference to well-assimilated black people, derived from the slur that they are "black on the outside, white on the inside".
Etymology from Wiktionary, CC BY-SA 4.0.