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1 definition by PwnzYouAll

A person who is fat, thus liking McDonalds or any Food and has done something really mean, stupid or gay.
"Guy #1: Yo see that fat guy over there? He was messin around with your girlfriend

Guy #2: WOW, what a McFag! Im Gunna kill him!"
by PwnzYouAll April 22, 2010
4 7