How many code words do you think Sam and dean have that we don't know about?
Like when Sam walks up to dean and says "I really want some rhubarb pie right now" to warn dean that there's a police officer in the vicinity
Or when dean pats Sam twice on the arm and says "I really want to go birdwatching again, that was fun" to warn Sam that there's someone watching them
Or "hey, I saw this super cool white cat on the way here, it looked cool." (The words "white cat" warning the other brother that the monster they are hunting is in the room, disguised or that they're currently talking to the monster)












