Do you know your Boosterism from your Backstopectomy? Can you tell Prometheus from Cincinnatus, and if so, do you know what Prime Minister Boris Johnson is trying to say when he namechecks esoteric figures from the classics, quotes obscure phrases from history, or even just plain makes words up?Certainly, Johnson is the most verbose Prime Minister of recent years, the result no doubt of a classical education, a closet full of public-school confidence and a former career as a wordsmith for The Times. Boris, more than perhaps any other leader, knows the importance of words, but he also knows how to have serious fun with them.