I love the black 'Yo mama...' series so much that when a Chicago Tribune reporter wrote to ask about cussing contests (my grandfather, Henry, was a San Francisco champion in the 1920s) I did a google on 'Yo mama..' which probably grew out of the same cussing contest traditions.
Here are three examples: "Yo mama so fat when her beeper goes off, people thought she was backing up.
Yo mama so fat people jog around her for exercise
Yo mama so fat she has been declared a natural habitat for Condors."
Just google 'Yo mama..'
The subject has a literary tradition reported in a book by Henry Gates, The Signifying Monkey. (I had the book in my library for two decades but never before connected it to the Henry Louis Gates.)