no kidding

informal

1. 1 —used to emphasize the truth of a statement No kidding, the test is tomorrow.

2. 2 —used to ask if a statement is really true “The test is tomorrow.” “No kidding?”

3. 3 —used to show surprise or interest in what has been said “My brother got engaged last month.” “No kidding! That's great news!” ; often used in an ironic way in response to a statement that is regarded as very obvious “If we don't start going faster, we're not going to finish on time.” “Gee, no kidding.”