The hole in the side of a wooden keg used to fill said keg with beer. The Bung Hole is then stopped shut with a bung and hammered in place with a bung hammer.
Despite its often misrepresented confusion with the Anus, bung hole is a perfectly useable word at state dinners with the governor...If you of course are in the study of fine spirits.
The beer poured out of the bung hole so fast, I had no choice but to swallow as fast as I could....(This could easily be taken the wrong way with the wrong definition)
