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1.
Abbreviation for "Nuts on ya chin". It is meant figuratively, and as an expression of superiority.

1. Used mockingly to provoke or taunt somebody that you just beat at a game.

2. Used to exxagerate an insult. Can also be used in place of the word "burn!"
1. "Haha. Noyc, noob, noyc. GG."

2. "Fuck you, punk-ass bitch! *Noyc!!*"
by Biomechanical December 01, 2005
 
2.
"Nothing of your concern" often said when someone asks "whats up?"
Nosy Person- Hey, Whats up?
Other Guy- noyc, u?
by noycman May 15, 2009