Willywaggling is a term often used when two men (preferably gay, or straight we don’t discriminate) come together with their erected, or semi-flaccid willies, touch, and wiggle together like a fish out of water
John : yo Alex, wanna willywaggle tonight?
Alex: sure bro, meet me behind the shed in 10, I’ll be waiting!
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.