Yo' Mama is so stupid, she called the police to report a suspicious looking person lurking in her mirror.
Yo' Mama is so fat, she has a kickstand on her peg leg.
Yo' Mama is so ugly, the tide wouldn't even take her out.
Yo mama so fat when they took pictures of Earth it looked like Earth had a pimple.
No!
You don't have "Bad luck".
You have low IQ and you make bad decisions.
You mamas so small she fell of her chair and committed suicide.
Bully: Your dick is probably like a tic tac.
Geek: No wonder your mom's mouth is so fresh.
Class: Oooooohhhh!
Yo momma so fat, she bounced over Wal-Mart, rolled over KMart, and landed on target.
"Yo momma so fat even her clothes have stretch marks!"
Yo mama so fat you have to grease the door frame and hold a twinkie on the other side just to get her through.