Oreo

Origin

Genericized use of Oreo, q.v.

Full definition of oreo

Noun

1. .
• 2012, Walter B.J. Mitchell, Stories I Tell My High School English Students, p. 78:The young woman said, "Well, actually we do have one minority student."
  The young man chimed in, "Yeah, but he's an oreo."
  "An oreo?" I asked. "Please define the term oreo."
  "You know," the young man said. "Black on the outside, and white in the middle."