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2.
ONC
Oral No Condom; what people use to get promotions.
Kim: "Hey, I got a promotion at work today!"
Andrew: "How did you get it?"
Kim: "ONC."
Andrew: "Oh, Oral No Condom, nice."
by VSU June 03, 2007
 
1.
ONC
A popular Steam community group (One Nut Crew) that initiates their members through shooting one of their testicles with a revolver, typically one made from gold. Officially formed April 24, 2013 by founder Keenan "Vern" Evans, ONC frequents many games, usually online, such as Garry's Mod, RoboCraft, Minecraft, Unturned, ARMA 2/3, and many others. They can be found on the steam community website under OneNutCrew.
"I ran into those ONC guys a while back, I could tell they were doing initiations by the gun shots followed by a long, high pitched scream."
by FatherVern July 22, 2014