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1.
It's like rigor mortis, except you're just too lazy to move.
"Afta 2 blunts, we all got nigger mortis."
by Sleepytime Jenkins January 08, 2007
 
2.
a common condition found in working age african american males; characterized by sloth, unemployment and indulgence in low grade marijuana and malt liquor
That third steel reserve caused niggermortis
by Captian C00nt November 19, 2007
 
3.
Due to a black man's inabilty to work, when someone asks said black man to work his body goes stiff.
Boss: Jamal, I need you to move these railroad ties over there. Don't let the niggermortis kick in! Move your ass
by Zakk133 April 17, 2011