Monoecious Share definition Flag (mono-shuss) Adj. Slang Very cool; awesome; very impressive; outstanding "You're a monoecious friend" or "That was one totally monoecious stunt, man!" Monoecious by ToriMP3 February 27, 2009 0 0 Get merch Get the Monoecious mug. Buy Now — $32.95 See more merch