So Fat:
Yo mama's so fat when she ate a salad the world's rainforests went extinct. So Stupid:
Yo mama's so stupid she rents a car so she can go to the dealership to steal a car.
Docter docter:
your mama is ssssooooo ugly that the docter slaped your grandmother for having her.
Humdy dumpy:
Yomama is like humpy dumpy,she gets humped then dumped.
Your momma:
hey get off the your momma jokes because i just got off yours.