She left her underwear at my house.

My mother doesn't wear underwear.

'Cause they don't make 'em that big.

'Cause you left skidmarks on 'em.

I translated a "yo momma" joke into Portugese and back into English on Babelfish, and although I don't remember the whole thing, "yo momma so fat" came out as "the breast of yo thus fat person."

So, I'm a big joke on Babelfish, eh?