Definition of no kidding
informal
1
—used to emphasize the truth of a statement
- No kidding, the test is tomorrow.
2
—used to ask if a statement is really true
- "The test is tomorrow." "No kidding?"
3
—used to show surprise or interest in what has been said
- "My brother got engaged last month." "No kidding! That's great news!"
- "If we don't start going faster, we're not going to finish on time." "Gee, no kidding."
