Where did the phrase metza metz come from?

The phrase "metz metz" is not a recognized idiom or phrase in any common language. It's possible that you heard it incorrectly, or that it's a regional slang expression or a made-up phrase.

Could you provide more context about where you heard this phrase? For example:

* What language were you speaking or listening to when you heard it?

* Who said it?

* What was the situation?

With more information, I might be able to help you figure out where the phrase comes from.