Here's something that I wish I had while studying for the SATs: Justin Heimberg's Yo Momma vocabulary builder book, which uses the one-liner joke to teach new words!
Yo momma's so emaciated, she can hula hoop in a fruit loop.
Yo momma's so obtuse, she thinks a webcast is when Spider-Man goes fishing.
Here's an interview with Justin at ABC News: Link
And yes, that's Justin with his mom (who happens to love the book, btw).
Yo mama's glasses are so thick she can see into the future.
Yo mama so stupid when she saw the NC-17 (under 17 not admitted) sign, she went home and got 16 friends
Yo momma’s so fat, her drivers license says, †Picture continued on other side.
You should totally come check out this new site, http://yomomma.tv/ – you can battle other people with your yo momma jokes and even tell them how whack their jokes are.