Here are some possibilities:
* Misspelling: Perhaps it was meant to be "met art," which could refer to art that is about or reflects on art itself. This concept is related to metafiction in literature.
* Specialized Term: It might be a technical term in a particular field like architecture, engineering, or even a specific type of art.
To clarify the meaning, it would be helpful to know the context in which you encountered the term. For example:
* Where did you see it? (A book, a website, a conversation, etc.)
* What was the topic being discussed?
With more information, we can determine the intended meaning of "metart."