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this is the term commonly used for the guy who is willing to "take one for the team" and hook up with the fat ugly friend that is usually blocking a much hotter and skinnier woman.

fat blockers are usually very non-discriminate and have a lower than average tolerance for alcohol, thus making the fatter ladies appear more attractive.

Every man should have a fat blocking friend.

guy 1: "I need a fat blocker before I make my move. Where did Brian go? He's the best fat blocker in town."

by Bill2455 November 04, 2005
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