A douchnozzle is an individual who is less than, or lower than, a douchbag. These individuals cannot be compared to the entire apparatus, but can only be reasonably compared to the business end of the device: The greasy, nasty little tip.
Look at that douchnozzle riding that scooter wearing those faggy-looking red, white and blue fingerless gloves! Rock on EASY RIDER!
Also, virtually all males seen driving convertibles with the top down and the windows up are douchnozzles.
Another example of a douchnozzle is anybody with a Batman tattoo.
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.