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1.
A state of lacking class, taste, intellence, and / or self-diginity, usually in reference to black culture, though it can refer to a member of any race influenced by Hip-Hop culture; a portmanteau of "ignorance" / "ignorant" and "nigger."
Examples of "Nignorance / nignorant":

"Yo, that new Ying Yang Twinz track is pure nignorance!"

"I can't believe Chad put spinning hubcaps on his Volvo. How nignorant of him."
by Curtis X Meyer December 04, 2010