Fat and slim are opposites. Make it make sense.

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[–] 36 points 2 weeks ago* (1 child)

According to this stackexchange:

fat chance is like a cynical no chance:

You think you can win the lottery? Fat Chance.

slim chance is when there is a small possibility. It does not infer any hidden meaning.

Even though I did not study, there is a slim chance that I will pass the test.

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