Answer 1

Yo mama so ugly even Voldemort won't say her name.
Yo mama so ugly the whomping willow saw her and died.
Yo mama so fat her wand is a Slim Jim.

Answer 2

Yo mama so poor she had to go to the Weasley's for a loan.
Yo mama so fat she ate the Death Eaters.
Yo mama so ugly everybody calls her "She-Who-Must-Not-Be-Naked!"

Answer 3

Yo mama so stupid she thinks Sirius Black is some hip hop station on satellite radio.
Yo mama so ugly her soul was taken by the Dementor's Friendly Handshake.
Yo mama so easy everyone in Charms class has Expelliarmused on her Wingardium Leviosas.

Answer 4

Yo mama so big they cut her hair with a Weed Eater.

Answer 5

Yo mama so bald she had attempted to work on a preschool but they...

Answer 6

Yo mama so white when she visited the White House she got lost!

Answer 7

Yo mama so tall she uses the Eiffel Tower for a dildo.

Answer 8

Yo mamas pussy so tight, ain't NO way youtube came outta there you...