Some that I remembered
Yo mama puts sugar under her pillow so she can have sweet dreams
When someone said it's chilly outside, she runs outside with a spoon
Yo mama is so stupid, she threw a rock on the floor and missed
Yo mama is so stupid, she falls up the stairs
Yo mama is so skinny, when she turns sideways she disappears
Yo mama is so fat, I try to walk around her and got lost.