shivverWrite a snippet of a conversation between two people who are trying to not let anyone around them know what they're talking about. They could be avoiding using names, using vague language, or even speaking in a coded language, such as referring to things only they would know about.
For example, a married couple who are discussing the troublesome neighbors across the street may be vague by saying, "It happened again," or mention "watching the football game" because they've previously used that euphemism between themselves for "listening to them fight".
Basically, the idea is to invent that shared history between the two people that allow them to speak privately in public.