A place famously known for 'where you control the action', that is the Jamberoo recreation park not the town, Jamberoo is actually a hole, with hills all around it often fills up with water. Most people living in Jamberoo are related, your next door neighbour is often your cousin and you have had kids with one of your other cousins. People from Jamberoo often have people say to them 'take your cow shit back to jamberhole' as people from Jamberoo are known for pretty much living in cow shit.
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.