Yo' Mama is so nasty, she put ice down her pants to keep the crabs fresh.
Yo mama so fat people used her as a tramp.
Yo mama so ugly that she saw herself six ways in the mirror!
Yo mama is so fat, she doesn't fit in this joke.
Yo' Mama is so stupid, she poured a bowl of Cheerios and said, "Look, my alphabet soup spells 'Ooooo.'"
Yo mama is so fat, it says to be continued, when she gets on a weighing-machine.
Yo Momma has so many chins, it looks like she's wearing a fat necklace!
Yo mama so ugly Lady Liberty blew her torch out so she wouldn't have to see her.
Yo mamma so fat when she looked at the scale she yelled, "Thats not my weight, thats my phone number!"
Yo' Mama is so stupid, she thought the international dateline was a global dating service.