CC is internet slang used for telling someone "chipkali chodder"
Guy: you are very stupid.
Me : JNL CC.
A: Hey, what's that game u r playing?
B: CC
A: Idk it
B: It's a 2008 game of 4 knights and it's good, it's on steam and xbox.
in the editing world, you make see a caption on a video containing and edit that says "cc" along with someone else's user name. This typically means coloring credit(s). Giving credit to the person who made the coloring for the edit.
*caption*, cc: editorfilms
My favorite cc said he was going to upload today but didn't! Well, time to spam him on Twitter.