"Balls to you" it comes from Liza Minnelli saying it in a inteview, there's a 2second long video of her saying it all over the interwebs, and is used for exprecing anger.
Happy high dude: Hello my good friend, wanna get high?
Pissed of gamer: B2U
Happy high dude: What kind?
Pissed of gamer: What?
Happy high dude: What kind of beat do you want? You said beat to you!
Pissed of gamer: No, balls to you! n00b!
Happy high dude: What?
Pissed of gamer: FORGET IT!!!
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.