"Polari," from the Italian "polare" ("to talk") is a coded language, originating in the U.K. and dating as far back as the 16th century. Overheard in outdoor markets, the theatre, fairgrounds, and circuses, it was appropriated by gay men to provide them with cover as well as with a way to assert personal and shared identities. It spread around the English-speaking world via the Royal Navy, the mer...