Often called a skinny. A nigger bone is a less than packed blunt. They are usually smoked by regular blunt smokers who are at the end of there sack and are lacking the weed to fully pack the blunt at hand.
Stoner #1: Damn, I only have like 3 bowls left and we dont have a piece but i have a swisher.
Stoner #2: Man role a nigger bone with that shit!!