roflmfao Share definition Flag rolling on floor laughing my fucking arse off. Used on online games with text chat, forums, ect. player1: (Box hits player1 and kills him) Ow... player2: ROFLMFAO roflmfao by Steven Gergus (A.K.A Gergy) March 4, 2009 0 0 Get merch Get the roflmfao mug. Buy Now — $32.95 See more merch