No Kiddin'!' is an expression used to emphasize the truth of a statement. It is often used as a response to express surprise or shock at what has been said. The crossword solution for the term 'No Kiddin'!' is GEE, which is an expression used to emphasize the truth of a statement. It is often used as a response to express surprise or shock at what has been said. The phrase is usually said with a strong emphasis on the word 'Kiddin'' to make it clear that the speaker is not joking.