My contributions to the Yo' mama thread, aimed at no one in particular...
Yo momma so fat she stepped on a rainbow and made skittles.
Yo momma so fat I ran around her and I got lost.
Yo momma so fat every time she walks out in public she causes a solar eclipse.
Yo momma so dumb she asked for a price check at the dollar store.
Yo momma so dumb she went to the movies and saw the sign that says 18 and under not admitted so she went back and got 17 of her friends.
Yo momma so ugly she went inside a haunted house and came back out with an application for work.
Yo momma so old she owes Moses a quarter.
Yo momma so black every time she steps out of her car the oil leak light comes on.
Yo momma so black every time she steps out of her house the phone rates go down.