Green’s Dictionary of Slang

n.i.c. n.

[abbr. nigger in charge under nigger n.1 ]

(US black) a sarcastic ref. to any black authority figure.

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M. Stewart We Beheaded for Execution Ch. 3 🌐 The derogatory uses of the term include the following: Nigger Babies, Nigger Boy, [...] Nigger in Charge (NIC).