Usually a reply when someone bully you in a foreign language which you don’t understand, but pretty sure that its something bad. Often used in internet when someone makes a point that is insulting and nonsensical at the same time.
Miguel: hijo de puta (Your mom is a hoe)
Bob: La tuya por si acaso (Yours, just in case)
--—---------
Noob: Urban Dictionary is bad for kids
Grandpa: La tuya por si acaso
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.