Fat Chance

I recall many using this phrase "Fat chance!" and I'm actually puzzled by how it came about.

- Fat chance! (informal) something that you say which means something is not very likely to happen.

I'm puzzled because... well, I don't know about most of you but, my idea of something fat is well, something large. Like in "Honey, do you think my butt looks fat?" or "I have just received a fat pay check today!" or "My goodness! That's a fat cat!"

So if that's my idea of "fat" then "fat chance" would then mean "huge chance".

"Do you think I stand a chance with that girl mate?" - "yea mate! fat chance!"

with that, I'd be walking up to the girl.


Ok, as I was typing this, I actually realised that there's also a phrase "Slim chance"

I checked it out on the dictionary:
Noun 1. Slim Chance - Little or no chance of success.

WHAT???? So which is it? If my chances are fat, success is not very likely to happen. If my chances are slim, I stand little or no chance of success...

Such a superficial world out there. Even our idioms are vain.