Abbreviation of "Now Blows Cock"
This term has been true and in effect ever since The Tonight Show With Conan O'brien got taken off the air.
Dude 1: "Hey have you heard, NBC is taking Conan off the air!"
Dude 2: "Ya I'm never watching that shitty station ever again, those executives suck balls for taking him off. He is the best."
Dude 1: "Ya, everyone know NBC stands for Now Blows Cock because of it. Fuckin assholes!