Mildew Mouth Share definition Flag a person with rotten teeth/ breath, who wont stop sending the stink your way when they talk Hey, mildew mouth, point that weapon some where else, its smell when you talk makes me want to hurl. Mildew Mouth by PattiePoe January 28, 2009 0 0 Get merch Get the Mildew Mouth mug. Buy Now — $32.95 See more merch