Your mama is so ugly that I guess you can say that the genes passed down.
Yo mama is so fat when she wears red they say look a firetruck.
Yo' Mama is so old, her teeth are like stars: they come out at night.
You mama is so fat, when she goes to the movies she sits next to everyone!
Yo mama is so stupid that when she got locked up in the supermarket she starved to death.
Yo mama so old she ran track with the dinosaurs.
Yo mama so old her drivers license in hieroglyphics.
Yo' Mama is so nasty, she gave me an ear infection over the phone.
Yo mama is so fat, the recursive function computing her mass causes a stack overflow.
Yo' Mama is so stupid, her wig has a chinstrap.