Your momma is so stupid she put airbags on her computer in case it crashed.
Yo momma is so ugly that when the Kool-Aid man broke through her wall he said, "Oh noooo!"
Yo momma's so stupid, she steals samples from stores!
Yo momma so dumb that when she was locked in a grocery store she starved!
Yo mama so stupid, she got hit by a parked car.