look up any word, like twoosh:
 
1.
When a person (esp. black person) has no job, makes no effort to find a job, and has no intention of ever finding a job.
"J.J. ain't goin' to the movies with us. He's broke."
"Why's that?"
"Nigga mortis."
by Officer Scrotes May 09, 2007
 
2.
When a white person is hanging out with any amount of black people and drops the word nigga. They immediately stiffen up and stay as still as possible in the hopes that the black people won't recognize they said the word nigga.
Some random white dude says nigga to a bunch of black guys, then the nigga mortis occurs.
by Grig starrrrrrrrrrr October 03, 2010
 
3.
The death of a black man. Initially the name of the album "6 Feet Deep" by Gravediggaz, but they had to rename it due to the whiney cunts that found it offensive.
"Christ, that punk got smoked."

"Yeah, Niggamortis"
by bunnygun1 June 19, 2008
 
4.
the phenomenal event that happens to black people after death where the muscles in the body stiffen.
Q: What happened to the black guy after he died?
A: He got nigga mortis!!!
by Contrary_Mary November 03, 2007