It can also be used as a term of endearment for a friend or family member.
Juice: "Yo, let me get a 6-piece NigNug and some honey to dip em' in, bitchface."
NigNug: "You bettah nawt be dippin' my ass in no honey. Sticky ass shit, I'll whoop your ass you whitebread muthafuckah."
Juice: "Damn, NigNugs are picky."
"Yo, hand me that lighter so I can spark this pipe, my nignug"
Also known as the most unfortunate creature in existence.