Oreo
noun
Or·eo ˈȯr-ē-(ˌ)ō 
ˈär-
plural Oreos
disparaging + offensive
: a Black person who is perceived as adopting the characteristic mentality and behavior of white middle-class people
Word History
Etymology
from Oreo, trademark for a chocolate cookie with a white cream filling
First Known Use
1968, in the meaning defined above