Your Catty Fatty

Worse than every other insult in the world including your doggy soggy.

Person 1: Hey, your mom gay
Person 2: Well Your dad lesbian
Person 1: But your granny tanny
Person 2: Haha, your doggy soggy
Person 1: Lol, your Catty Fatty

The whole multiverse explodes and everything that ever existed becomes a black hole and sucks everything in and then it sucks itself in and all that is left is the insult.