LMFGDAO Share definition Flag Short form of Laugh My Fucking God Damn Ass Off. Depending on the person's age, gender, and many other variables, the use of LMFGDAO can be annoying, funny, or common ground between both. LMFGDAO by Johnny Rocketfingers October 11, 2003 0 0 Get merch Get the LMFGDAO mug. Buy Now — $32.95 See more merch