"Deine Mutter"-jokes are often used among German teenagers. You can use them to insult someone (or his/her mother).
Otherwise you can use "Deine Mutter!" -> "deine mudda!" (pronounce it die-ne mu-dah) as a slang for "shove it" or when you want to deny sth.
And you can compare it with "your mum".
As an insult:
- "Deine Mutter steht vor KiK und schreit "Nur ich bin billiger!"."
(Your mother stands in front of KiK (that's a cheap boutique, where nobody wants to buy his/her clothes) and shouts "Only I am cheaper!" (cheaper in the meaning of slutty))
And as "shove it":
- "Bring doch den Müll runter"
(Carry off the trash)
- "Ey, deine Mudda!"
(Your mum!)
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.