Moo-Vag Share definition Flag A big cow vagina who’s always like moo this moo that e.g. Oli you're such a Moo-Vag about everything Moo-Vag by Poop-A-Doop September 14, 2014 0 0 Get merch Get the Moo-Vag mug. Buy Now — $32.95 See more merch