A jest is a joke. Are you a playful prankster? A jocular jokester? A witty wisecracker? Then you are definitely well versed in the art of the jest.
To jest means to banter and joke in a playful way — like a "court jester," whose job it was in medieval times to entertain the royal court with funny stories. Today when we jest we generally joke around or gently tease. The noun's meaning evolved over time, from "idle tale" to "mocking speech," and finally to "joke."