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1.
A level of such rage and aggression that cannot be described by ferocity, its sister word. To rage beyond control. To be so upset, you are foaming at the mouth and everything is a target. This is ferocity on crack.
"Shit did you see Brenden after we got kicked out? Yeah man, his nigrocity was through the roof. Thought he was gonna kill a bitch."

"Doctor: I got the test results back....It seems the reason you can't hold a job is because you have disturbingly high levels of nigrocity in your blood. Patient: Oh dear God...."
by Samuel Baduci September 29, 2009