Definition from Wiktionary, the free dictionary
Brand name of unknown origin, trademarked in 1912.
Oreo (plural Oreos)
- A cookie made up of two light black, chocolate wafers joined by a layer of white, sugary filling.
- (US, mildly pejorative, slang) A black person who embodies the social and cultural features of a white person
1971, Iceberg Slim, The Naked Soul of Iceberg Slim, Holloway House:
- She's a pure Oreo. You know, like the cookie, black outside and white inside.