Here are two examples of a very popular children's hand clap rhyme that includes "yo mama" lines:

Brick Wall Water Fall (Example #1)
Brick wall waterfall boy/girl you think you no it all you dont i do so shh whith that Additude Your Mama your daddy your balled headed granny she 99 she thinks shes fine she going out whith frankinstine shes hip shes fat she needs a tic-tac not a tic not a tac but the hole six pack im sorry to be mean but she needs some listrine not a sip not a swallow but the hole bottle
-Timothy, 2/2/2006; http://www.cocojams.com/taunting_rhymes.htm

**

Brick Wall Water Fall (Example #2)
A...B...C...Hit It That's the way ah-uhh-uhh i like it uh-huh ah huh that's the way ah-huh-ah-huh i like it ah-huh-ah-huh You have your way i have mine peace punch captain crunch brickwall waterfall boy you think you know it all You don't i do So POOF with the attitude no wait... come back i think you need a tic-tac not one,not two but the whole six pack yo mamma yo daddy yo bald headed granny she's 99 she thinks she fine She's goin out with Frankenstein so go, go granny go, go granny (repeat go go granny until feel like stopping)
-Katherine; 5/6/2007; http://www.cocojams.com/taunting_rhymes.htm