What does the phrase mean a mean?

The phrase "mean a mean" is not a common or recognized phrase in English. It's possible it's a typo or a misunderstanding of a different phrase.

Here are some possibilities for what you might be thinking of:

* "Mean what you mean": This phrase encourages clear and honest communication. It means to be direct and unambiguous in your speech and actions.

* "Mean to be mean": This phrase implies intentionally causing harm or offense. It suggests that someone is acting maliciously.

* "Means to an end": This phrase refers to something done to achieve a specific goal, even if it's not desirable in itself. It implies that the end justifies the means.

If you could provide more context about where you encountered this phrase, I might be able to give you a more accurate answer.