What does “you're kidding” mean?

used to show that you are very surprised at sth that sb has just said

How is “you're kidding” used?

In Paths of Glory (1957), one line is: “Just me and Meyer? You're kidding, sir.”

The clip at the top of this page is from Paths of Glory (1957).

Just me and Meyer? You're kidding, sir.

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