the act of fucking about frantically in a tool shed in the attempt to put together some sort of creation, often used to imply a disaster of some kind has occurred in the process of building said item.
"why are the shelves in this bookshelf not horizontal?"
joping by a construction team is a common side effect after construction team has been doping, eg: car park with lines guiding cars for parking being too close together; dog kennel with dog inside, but no doors for dog entry/exit.
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.