Oreo
or o·re·o
[awr-ee-oh, ohr-]
noun, plural O·re·os. Slang: Disparaging and Offensive.
a black person who is regarded as having adopted the attitudes, values, and behavior thought to be characteristic of middle-class white society, often at the expense of his or her own heritage.
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Origin of Oreo
An Americanism dating back to 1965–70; from trademark name of a chocolate cookie with a white cream filling
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Oreo
derogatory word for "black person felt to have a 'white' mentality," 1968, black American English, from the snack cookies, which consist of dark chocolate wafers and white sugar cream filling (hence "brown outside, white inside"). The cookies (made by Nabisco) date from 1912; the source of the name has been forgotten.
Online Etymology Dictionary, © 2010 Douglas Harper