First of all you are going to Jungle!

1.) Begin by selecting Rammus with Smite / Flash
This will let people know that you want to Jungle
You may even say something like "I'd Like To Jungle Please"

2.) Begin to rotate Jungle selections between heroes like
Shaco Shyvana Maokai Lee Sin
This will give the impression that you are very well learned in the art of Jungling
and you intend to pick the best Jungler for your team!

3.) Lock Jungle Twitch