Yo' Mama is so dumb, if her brains were farts, there wouldn't be enough to stink.
Yo' Mama is like a donkey: everybody rides the ass.
Yo mama is so fat she has to write an apology letter to Japan.
No! You don't have "Bad luck". You have low IQ and you make bad decisions.
Yo mama teeth are so yellow when she smiles traffic slows down.
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?
Yo mama so fat people used her as a tramp.
Yo mama is so fat, she doesn't fit in this joke.
Yo momma is so hairy when she lifts her armpit up it looks like she's got Bigfoot in a headlock.
Yo' Mama is so stupid, she poured a bowl of Cheerios and said, "Look, my alphabet soup spells 'Ooooo.'"