An expression you use when you have just typed something entirely unintelligible or when you type one word when you meant to type another. Usually due to other things on your mind at the time.
Bill: check out my girlfriend's new picture -link-
Bob: hmm, i dont remember seeing that tits before.
Bob: and by tits, i meant shirt...
Bob: wtfingers.
Bill: >:(
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.