An alcohal induced illusion much like a miragewhere you find your existance altered to either a pleasant reality or a terrible nightmare. Beerages usually manifest in the bar or club scene when you are one of the last 9 people left, and you see the most beautiful woman ever before you. You go home with jenna jameson and wake up next to a 3rd generation inbread woman with leg braces, 4 teeth, and a mustache thicker than grizzly adams with the armpit hair to match, green stained undies and a crotch that smells like rotten cabbage.
"Dude, clark went home with a total swamp donkey last night. He definately was caught in a beerage!"