Variant of the acronym, lmfao (laughing my f****** arse off) or lmao (laughing my arse off). Lmfato (or lmfatao) stands for laughing my fat off or laughing my fat arse off.
by Chopsticks February 17, 2008
Get the lmfatomug. Get the lmfatomug. Get the lmfatomug.