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1.
the act, or art of performing a technical task in a way such that the use of tactics relevant to a person of African American decent would consider doing. Also reminiscent of a job performed by a person of limited means.
"Damn son, that's some use of nigonometry there, you held your bumper on with duct tape!"

by Josh Aldrich August 14, 2007
 
2.
A version of triganometry made for black people which is extremely easy. It usually covers things like naming types of triangles or drawing them, and if the class is advanced, measuring them.
Shequan: Dude, in nigonometry class today we learned how to draw right triangles!
Jamal: Wow man that's crazy, I heard nig is super hard.
by uzi does it April 01, 2010