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1.
(n) the action of having sexual intercourse with a black person; fucking a nig
I performed a fucknig last night with that black chick.
by RARRR September 09, 2007
 
2.
A most foul insult.

Reserved for when any other insult just won't do.

Can be used to cover up a typo when trying to write fucking.
"Yeah? Well you're a total fucknig! How do you like them apples?"

"Fucknig? FUCKNIG? How dare you call ME a fucknig?"
by Secret Valks September 11, 2007