Can we do, yo momma jokes like-
Yo momma's so fat every time she takes a step she measures on the richter scale.
Yo momma's so fat she sinks in the dead sea!
Yo momma's so fat when she takes a cruise the whales come out of the ocean and sing "we-are-fam-ily"
Yo momma's so stupid she tried to kill a bird by throwing it off a cliff...
What do ya think? I made the first two up myself.