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1. I agree; you're right; that's true. A: "Wow, that exam was brutally difficult." B: "Yeah, no kidding!"
2. Are you being serious? A: "My aunt has a cabin we could use for the weekend." B: "No kidding? That would be awesome!"
3. I'm being honest or serious. No kidding, this boot camp will get you in the best shape of your life.
1. Inf. You are not kidding me, are you? (An expression of mild surprise.) Jane: I got elected vice president. Bill: No kidding! That's great!
2. Inf. Everyone already knows that! Did you just find that out? (Sarcastic.) Sue: It looks like taxes will be increasing. Tom: No kidding! What do you expect? Alice: I'm afraid I'm putting on a little weight. Jane: No kidding!
See also: no
Truly, seriously, as in No kidding, I really did lose my wallet. [Colloquial; first half of 1900s]
1 (sometimes ironic) used to emphasize that something is true or that you agree with something that somebody has just said: ‘It’s cold!’ ‘No kidding!’
2 used to show that you mean what you are saying: I want the money back tomorrow. No kidding.
exclam. I am not kidding.; You are not kidding (are you)? No kidding! I never thought she would do that.
See also: no
1. Used to express surprise or disbelief.
2. Used to express scornful acknowledgment of the obvious.