Yo mama so fat when she was in school she sat by everybody!
Yo momma is so fat, that when NASA put her on the moon, her breasts were the only things bouncing... just like on earth.
Yo mamas so ugly, she scares blind kids away.
Your momma is so ugly when she gets her beauty sleep she falls into a coma!
Yo' Mama is so old, she went to an antique shop, and they kept her.
NOTE: This joke is only for those who recently had a brain transplant. DO NOT read ahead unless you don't mind being offended. You're still reading this, aren't you, asshole?
Q: Why don't fat people were turtlenecks? A: Because turtles are now endangered.
Yo mamma so fat she broke your family tree.
Yo mama's so fat that even Barack Obama couldn't afford to take her out to dinner.
Yo momma's so fat when she hauls ass she has to make 2 trips.