No way

idiom

Not possibly.

1. Something that you say in order to make very clear that your answer to a question is 'no'.

eg.

-Have you paid for the repair yet?
-No way! Not until we know for sure that the computer is actually working.

2. Something that you say when someone says something that is very surprising.

eg.

-Hey, I saw Ellie out with Andrew last night.
-No way!