A male or female who is in the class of gargantuan size due to the mass consumption of McDonald's.
A male or female who consumes more McDonald's then he/she consumes oxygen.
Copyright: Joseph M Burns
Man that chick over there just downed 5 BigMacs, she's a real McFatty.
That dude comes in 3 times a day, 7 days a week. Doesn't he have a life? What a McFatty!
Joe has his girlfriend Carmen, who works at McDonald's bring him mass amounts of food after every shift, he's a McFatty.
Bailee did not copyright the word McFatty. Joe did!