Guinness Pig Share definition Flag The Frat brat who hogs all the Guinness! "Hey, save some for us, you Guinness Pig! What are you trying to do, set a Guinness Drinking Record?" Guinness Pig by Mike Cox November 24, 2006 0 0 Get merch Get the Guinness Pig mug. Buy Now — $32.95 See more merch