A single dark skinned person surrounded by a group of light skinned people. Possibly, but not necessarily a token black. A racial variation of fly in the ointment.
Jackson: This is my school picture from the early days of desegregation.
Williams: You look like a fly in the buttermilk.

Aaron did not realize that he had only been hired to make the company seem as if it promoted racial diversity. He became discouraged on the first day of work at the firm when he realized that he was the fly in the buttermilk.
by gr8rt1 November 13, 2014
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