eau de methane Share definition Flag The fragrant flatus perfume emitted primarily by cows responsible for hastening global warming. Driving through America’s heartland, the inviting scent of eau de methane gently wafts into our nostrils. eau de methane by Dr Bunnygirl August 8, 2019 0 0 Get merch Get the eau de methane mug. Buy Now — $32.95 See more merch