Yesterday, James Comey caused quite the stir when he went on Instagram and posted a picture of a shell formation on the beach — obviously one he made — that spelled out “86 47,” which many interpreted as a threat on President Trump’s life. Since then, everyone’s been arguing over the definition of “86.” As slang goes, it has a wide variety of uses, some of which are more innocent, such as when you run out of a menu item at a restaurant you “86” it or when you get kicked out of a bar for being too drunk or...