What is what does no pun intended mean?

No pun intended is a phrase used to clarify that a word or phrase that may have a double meaning or was used in a humorous way was not intended to be a pun. It is often used when a statement might be misinterpreted as a joke but the speaker wants to emphasize that they are being serious. For example, "I'm going to watch the wheels of the bus go round and round, no pun intended." The phrase is a way of avoiding confusion and making clear what the speaker means.