I know what the word "discount" means. When I say "what do you mean by 'I'm discounting'?", is "What do you mean when you say that I'm regarding a possibility

I know what the word "discount" means. When I say "what do you mean by 'I'm discounting'?", is "What do you mean when you say that I'm regarding a possibility as being unworthy of consideration?" What possibility are you referring to that I'm regarding as being unworthy of consideration?