When someone doesn't text you back after you text them, you text them "cat got your thumbs?". It's a play on "cat got your tongue?", which is an idiom used to compel someone to speak who is unusually quiet.
Sam texts: "Hey what's up, I'm in your hood"
No response....
Sam texts: "Cat got your thumbs?"
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.