A term used in the form of "emotionally" connecting with somebody new.
Derived from the construction toy/puzzle known as "k'nex" where in which pieces of plastic are connected together to make buildings, cars etc...
For example,
Two guys are in a bar, one guy goes over to a girl and they talk for half an hour, gaining her phone number. The other guy then nudges him and says
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.