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The phrase "fat chance" can be used as a way of sarcastically describing the impossibility of something, but where did it originate from? I've googled it several times, and it always comes up with the definition, not the origin.

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My guess would be that it's either sarcasm, implying it has an extremely slim chance of happening. Or it's implying that it would take an extremely large chance happening to occur. I hope you get a good answer. – Wayne May 18 '11 at 1:30
See also fat lot of good: english.stackexchange.com/a/47296/9001 – Hugo Oct 27 '12 at 10:13
Could it be to do with the scarcity of food in wartime and the chances of getting fat were rare – user135252 Aug 25 '15 at 7:01
If an expression consisting of normal words is used ironically, i.e. meaning the contrary of the expression you won't find such formulas of irony in etymological dictionaries and questions about the origin of an ironic formula won't get you far. – rogermue Aug 25 '15 at 8:51
up vote 9 down vote accepted

I believe this simply derives from one sense of the word fat:

fat 2a well filled out : of sizable proportions : THICK <a ~ letter> <a ~ volume of verse> : BIG <a resistor spark plug ... permits a wider gap, thus a fatter hotter spark — Newsweek> : unusually large <he had to pay a ~ price to move his factory — Martin Turnell> [Websters 3rd New Int'l Dictionary]

The term is used ironically. At face value it means there is a large chance of something happening, but underneath it really means there is a slim chance after all.

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