Deine Mutter

"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".

Done