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1.
The process or event of acting like a nigger. Or in other words, being a jackass/complete moron.
Tyrone was being niggerdly when he used a rusty nail to eat his dinner.

Shaqueefa stole my bike, and I said, "You ho! Quit being niggerdly!"
by W-Mart July 18, 2006
 
2.
The act of being stingy or cheap. Coined by WingsofRedemption
Your sister is being very niggerdly with her pussy.
by theniggerdlyman May 31, 2012