Thanks p, I'm gonna perusing that for a while.
Oh yeah, there's the grittily-realistic subgenre. Yo mama so fat,
- she has a severely impaired quality of life
- she got Type II diabetes
- she gotta use a special implement to wipe her ass
- she dead already!
and so on.
If you want to go hard-nerd, try: yo mama so fat, she look red all the time!
Yo mama so fat, she got an accretion disc!
Misc.:
Yo mama so fat, I lifted a fold and found Lord Lucan.
Yo mama so slutty, when you call strangers "bro" you're probably right.
Yo mama so nasty, Jabba the Hutt feeds his prisoners to her cunt.