tracksuit bottoms with elasticated waists, designed for the more overweight. they are popular in ireland with knackers, and D4s, who wear them stuffed into Ugg boots or Dubes.
Knacker: Alri anto, nice fat man pants ya got on der
Anto: Fuck off ya bleedin homo
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D4 1: Oh ma god babes, totally got myself a pair of fat man pants yesterday.
D4 2: ooooh babes! where?
D4 2: im too embarrassed to say babes. its like a total fucking descent into lower class. but there is a recession on..
D4 1: where did you get them babes?
D4 2: *blushes* Dunnes Stores.
by fatmanpants November 30, 2008
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Having a disproportionately fat ass, thighs, and upper pussy area to the point of being comical, resembling clown pants; extremely bottom-heavy; having enough fat to fill a pair of clown pants.
Guy 1: I heard Steve's new girl is pretty thick. Would you hit it?
Guy 2: Nah, man. She's clown pants fat. I couldn't fit it in if I tried! And that's assuming I don't throw up first.
by RawBZA October 19, 2010
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An effective rebuttal used by a man who has just been denied dancing privileges with the woman of his choice in a noisy club.
Man (yelling over the music): "DO YOU WANT TO DANCE?"
Woman (with a disgusted look on her face): "Not a chance!"

Man: "WHAT? NO. I SAID, YOU LOOK FAT IN THOSE PANTS!"
by What the ? February 22, 2006
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