/awr"ee oh', ohr"-/ , n. , pl. Oreos . 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. Also, oreo .
[ 1965-70, Amer. ; from trademark name of a chocolate cookie with a white cream filling ]