An angry verbal response when one feels disrespected and carries much angst towards the instigator. Not to be confused with "fuck off," "nyx off" is a much stronger reply with perennial hatred and anxiety.
Person A: I have an annoucement to make. My exepectations are that you all will abide by my rules.
Person B: Nyx off.
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It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.