LMFAOAS Share definition Flag An abbreviated term for "Laugh My Fucking Ass Off And Shit." Mort: so I kicked the nun in her shins, and she ate my arm off in defense! Muhammed: LMFAOAS that's grand! LMFAOAS by skelefetus October 27, 2008 0 0 Get merch Get the LMFAOAS mug. Buy Now ā $32.95 See more merch