Your MUM, the woman that paid Big Spence to Shag her. (gave him a cookie too)
This little description can bring so much joy to the speakers name. Implying masculinity and marginalising ones friends, the quintessential comeback for teenagers. Many jokes have been derived from this one simple insult, such as:
Your momma so fat, when she goes to sizzlers she pulls a chair up to the salad bar.
Your momma so fat I gotta roll over 3 times to get off her.
And if your friends don't like it, you can simply come back with: Your mum.