Adjective: Aesopian (ee-SOH-pee-un)
1. Of, relating to, or characteristic of Aesop or his fables.
2. Conveying an innocent meaning to an outsider but a hidden meaning to a member of a conspiracy or underground movement.
Sample sentence: What sounded like a friendly greeting from Jerome was in fact Aesopian code warning his partner, who had just entered the apartment, that an uninvited visitor was in the room.