Originally intended as a derogatory term referring to the state
of African descent who doesn't acknowledge their African heritage.
The original usage has been supplanted and the term is actually a friendly joust used to describe
a random, anonymous, unrecognizable person
of African descent.
It's counterpart for white people is Wigga or Wigger.
"Man, I couldn't dress my Sunday best today. I had to go IncogNegro for the blend."