Similar to a wet willy, a wet wendy is when you turn the palms of your hands towards your face, stick out your tongue and lick the outer edge of your hands (up to your pinkies) then target an ususpecting victim, and wipe the afore mentioned moistened hands down their nose.
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.