When you say you don't have anything to begin with. Or when you are unable to help out even if you were to try your very hardest.
Person 1: Do you sell drugs?
Person 2: No, Sorry.
Person 1: *comprehends person 2 never sold drugs to begin with*
Person 1: So you are also saying that you never sold drugs to begin with? Correct?
Person 2: Yes, that's what I meant by No Sorry. Plus I can't help even if I really wanted to.