Term used in the Oil and Gas Industry describing a well where no information is to get out. Info is only shared between the most trusted people. Can be used in everyday speech for a deadly secret that others are not to repeat and you would only tell a spouse or old friend.
Honey, I actually like men and not you. I will stay married with you for the children. (No need to say this is super tight hole information.)
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.