the term "for sure" was a ghetto response to a question that means yes
Hipsters have taken this term, and with irony turned the tough about-to-shank-you word into something that's insane amounts of adorable, like a puppie sleeping next to a kitten
"sexy tight jean wearer: "are you still going to meet me and katy at starbucks for our poetry session?"
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.