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1.
Racist term for Brazil nuts
My favorite nuts are almonds, but I don't like the nigger knuckles.
by Steph X March 17, 2007
 
2.
The finger specifically used for anal penetration during sex.
"Give her the old NiggerKnuckle last night?"

"So then I gave her the NiggerKnuckle and she screamed."
by Dedsexidaddi August 09, 2013