A primative musical instrument created and used by the aborigines of Australia. It's a wind instrument having only 2 tones, both of which are quite low in frequency.
Most people have heard the deep resonance of this intrument in the background of movies where it's used to promote an atmosphere appropriate to an Australian outback theme.
The night was silent except for the mysterious sound of a diggerydoo whose low pitched tones could be heard from a distance.
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.