(Noun) An individual whose physique becomes enlarged and grotesque as a result of consuming too much McDonald's food. This phenomenon, albeit formerly unnamed, gained national attention and was popularized by the documentury "Super Size Me."
Fatty McFatsofat at the Drive-Thru: "I'll have two Big Macs, no wait, make that eight Big Macs. And... throw in a batch of fries, you know, a whole basket full, however many large-sized fries that is... One McRib, three of this little cheeseburgers, a twenty-piece Chicken McNuggets... and..."
Morbidly obese person who has tons of flab or rolls. they constantly eat at Mcdonald's and the employees pay this person not to consume them, because they will eat you.