Yo momma's so hairy, she was mistaken for the missing link.
Yo momma's so stupid, she tripped over a cordless phone!
Yo momma's so stupid, she called 411 to ask the number for 911!
(911 is the emergency number in the US, and 411 is the information number)
Yo momma's so ugly, she sin't allowed to have a mirror near her.
Yo momma's so fat, her frontside and backside look alike: fat, ugly, and round!
Yo momma's so fat, last time she saw 90210 it was on a scale!
(an american TV show)
Yo momma's so fat, she blocked out the sun and scientists thought it was an eclipse.
Yo momma's so fat and ugly, when she walks, everyone hides and says, "GODZILLA!"
Yo momma's so fat, when she walks she causes an earthquake, volcanoe, and tsunami at once.
Yo momma's so fat, when she farts meteorologists say, "Batten down the hatches, we got a huge Tornadoe coming!"
Yo momma's so huge, when she breaths out, people say, "It's Hurricane Mother, lookout!!!!"
Yo momma's so huge, she has her own center of gravity.
Yo momma's so stupid, when she was buying deodorant for your father, the clerk asked her if he used the ball kind, and she said, "No, the one for under your arms."