Coin a Phrase

What do you call the practice of having multiple iChat's going during a conference call? Typically these side chat's consist of things you don't want to say out loud, like insults or general W.T.F. comments.

So any ideas as to what this pratice should be called?

One of the suggestions so far was "Spitballing", which unfortunately is already used for a similar verbal process.

Spychat, duplexing, pri-chat, or what?