Something that is unfavorable to a particular individual or group of people. It can be used similarly to the use of the word bullshit. ns is the abbreviation of the word. It can also be used to refer to things or peoples actions that are ratty.
Man that was some nigshit back there, I can't believe we got negged from that party for no reason.
That's some nigshit, how in the world did the Pats lose to the Giants in the Super Bowl?
Dude he pulled some major ns not calling us back after he told us he would, what a rat.