So's your mum!

[moment_of_sen]

Historic examples of Yo Mama jokes:

William Shakespeare used such a device in Act I Scene 1 of Timon of Athens:

Painter: "Y'are a dog."
Apemantus: "Thy mother's of my generation. What's she, if I be a dog?"

Also in Act IV, Scene II of Titus Andronicus, Aaron taunts his lover's sons:

Demetrius: "Villain, what hast thou done?"
Aaron: "That which thou canst not undo."
Chiron: "Thou hast undone our mother."
Aaron: "Villain, I have done thy mother."

Thanks, Wiki!