Anyways, if you don't know what I mean by this, here's an example:
Me: Yo momma's so fat, __________________
You: Well yo momma's so stupid, ___________________
Me: Well YO momma is so dumb, ___________________
etc, and so on.
It's basically 'say something about the poster above you' except it's telling them about how their momma is so this, so that, etc. Let's get started shall we?
.............that means someone give me a yo momma joke.
(NOTE: This thread is just a game, this is not an offense to all the moms out there)