beer seal Share definition Flag the thing that stops you pissing every 2 minutes, after a few beers the beer seal breaks and you spend half the night pissing. good for alcholic sewer rats but not so good for us. i almost made it to 3 beers but the beer seal has gone now... beer seal by 5finger December 16, 2012 0 0 Get merch Get the beer seal mug. Buy Now — $32.95 See more merch