Beer plugs are the auditory equivalent of beer goggles. When you’re wearing them, everything that you and your fellow partiers say sounds brilliant, fascinating, and charming. To someone who left his beer goggles at home, you all just sound like a bunch of drunken idiots.
Note: A friend and I came up with this term last year or the year before. I found the term on someone else’s blog from 2006, but he was referring to the volume of drunken conversation. I prefer the definition above but of course, I invented it.