I always wish my friends and I knew a secret language that no one else knows so we could speak to each other without anyone being the wiser. Sometimes, with the ones who know it, we will use Japanese if we want to be discrete about something.

At work, a friend and I have a code word that we say if someone is coming into our section. Basically, we say it then start talking about it. It is inconspicuous since we always talk about that topic anyways.