cmao Share definition Flag crying my ass off. used just like lmao is used to abriviate laughing my ass off 1: "Sup 2??" 2: "Nuthin Much, cmao" 1: "Wat Happened??" 2: "I Got Dumped =" cmao by sum real shit January 4, 2008 0 0 Get merch Get the cmao mug. Buy Now — $32.95 See more merch