Made famous by the Bash.org Top 100 list, "I put on my robe and my wizard hat" refers to the fake cyber sex dialogues of BloodNinja.
bloodninja: Baby, I been havin a tough night so treat me nice aight?
BritneySpears14: Aight.
bloodninja: Slip out of those pants baby, yeah.
BritneySpears14: I slip out of my pants, just for you, bloodninja.
bloodninja: Oh yeah, aight. Aight, I put on my robe and wizard hat.
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.