A smart comment is a remark that is clever, witty, and often humorous. It is usually made in response to a situation or statement, and is intended to be entertaining or thought-provoking. The crossword solution for the term 'smart comment' is 'OUCH, ' which is an expression of pain or discomfort. It can also be used as a humorous response to a situation or statement, implying that the comment was so clever or funny that it caused physical pain.