Whenever a person eats an excessive amount of food, even if they are thin. This phenomenon is unexplainable by doctors, but still happens.
Man 1: "I heard that John was diagnosed with Fat Man Syndrome."
Man 2: "I would have never guessed... he's so thin!"
Man 1: "But he eats a hell of a lot!"
by K-cin January 15, 2009
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A silly attempt at dancing done by outrageously overweight people by slowly rotating the hips, lifting a foot at a time, and the arms, kept at 90 degree angles swivel side to side.
Kyle, that fat bastard, ruined our no fat people dance by doing the fat man dance.
by The Skinny Guy December 9, 2005
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Fat Man pants are elasticated, comfortable trousers worn by the more gluttonous members of society. They stretch, they're comfortable and supply a beautiful breeze whilst wearing them and going commando simultaneously. They can be worn at all events and weddings are often frequented by fat men in fat man pants.
Ricey: You hitting club trax tonight?

The Cardinal: Aye, coming straight from a wedding

Mad-fuck Hanna: Club Trax in a tux?

The Cardinal: Obviously not, I'm hitting it in my burgundy fat man pants and straw hat.
by CommanderFatManPants July 24, 2010
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A fat overweight man who's mad at the world and suffer from asperger's syndrome and hair loss. A grotesque sight to behold and angry at everyone around them including their own mother whom they make life a living hell for.
That angry fat man needs some lovin. Someone give him a pity fuck.
by swims9 July 11, 2008
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The Art or talent of being a complete fatty, and still being able to whoo, white women, and bump they heads,

Originating in 1996, the act usually consists of being a fat shit, but using all of his exterior sensory modes to convince stellar, non fat bitches, to hop in the sack with him.
(person 1) Yo, did you hear Jon bagged "so and so" ?,

(person 2) hooo, ya damn right, he be bringing that fat mans charm, and they can't contain themself.
by Jon Himself March 14, 2003
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