Niwigger Share definition Flag A black person who thinks they're white, but tries to speak Ghetto. Like Carlton trying to speak gangsta to Wil on Fresh Price Look at Melanie with all of her white friends trying to speak ghetto. She's such a niwigger. Fail. Niwigger by Whoopie-Baybee September 23, 2010 0 0 Get merch Get the Niwigger mug. Buy Now — $32.95 See more merch