Fat chance


The expression is used to refer to something that is incredibly unlikely. Bizarrely, and contrary to what one might expect, the related expression ‘slim chance’ means the same thing. The origins of this expression are unclear, but the use of the word ‘fat’ is likely to be a sarcastic version of saying ‘slim chance’. A similar expression is ‘Chance would be a fine thing’, which refers to something that one would like to happen, but that is very unlikely.