MFIW Posted in M Best definition MFIW My family is weird. From the Tumblr blog ahouseoffreaks You would say something strange that your family did and then add MFIW on the end. my family just ate me…mfiw How satisfied are you with the definition? Looking for MFIW meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 17 times.