What is the origin of phrase man an

The phrase "man an" isn't a common English phrase, so it's difficult to pinpoint its exact origin. It's possible you meant "man and" or "man, and" but without more context, it's hard to give a definitive answer.

If you can provide more context, such as:

* The full sentence or phrase where you heard it.

* The context of the conversation or text.

* Where you heard it (e.g., a book, a movie, a conversation).

I can then provide you with a more accurate explanation.