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1.
A fat trailor trash nigger who's accustom to waiting near Mcdonalds closing then asking for various freebies.
Ha, we went through the drive thro last night and almost hit a McNiglet.
by PrOzAk December 07, 2003
 
2.
A black child with no limbs.
Did you hear that Shawneequa's kid is a McNiglet?
by Jonny Hammerstyx December 22, 2010
 
3.
Racial slur; black children who eat a lot of fried chicken, preferably McDonald's Chicken McNuggets.
Black teen #1: I want some McDonald's, my nigga.
Black teen #2: Word to my mother, you are such a McNiglet, I swear.
by The Reebz January 22, 2012