(1) In Old French oeiller was to fill a cask to its eye or bunghole - to the eyeballs, as you might say.(2) If you're using a barrel, fill it to within an inch of the bunghole .(3) To get the juice through the bunghole , a device like a small half cask with a tube on the bottom termed a tundish or tunpail was employed as a funnel.(4) It sounds obscene, but it's the short form of Ungespundetes, a beer matured in barrels with open bungholes so the fermentation fizz escapes.
