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1.
Any object carved down to a point. known as a "shib."
Can be made out of simple things including toothbrushes, sticks, bedposts, rocks, and chicken bones.
When jerome's gat jamed during the turf war, he pulled out his nigger blade to stab the frontin gang.
by Tyronne Biggums November 05, 2006
 
2.
A broken bottle, it's sharp edge used for cutting or stabbing.
"Come to think of it, my grandmother did once refer to a broken bottle as a 'nigger blade.'
by TashaMK August 15, 2006