Charlie brown, and cha cha not sure what the meaning for the dance is

Do you mean to ask what is the Charlie Brown on the cha cha slide?
If so, it is where you hop from your left front foot to your right foot which is behind you.

See the following:
Cha Cha Slide

You can view it on YouTube: YouTube - Cha Cha Slide Charlie Brown (at My Birthday)

The complete lyrics: Cha Cha Slide Lyrics Dj Casper Paroles Songteksten Letras

How to do the cha cha slide:
Cha-Cha Slide - How to Do the Cha-Cha Slide