What does the word Jau mean in German?

"Jau" is not a standard German word. It's likely a regionalism or slang term, possibly used in certain parts of Germany or Austria.

It's important to understand that language is constantly evolving and regional variations exist. To understand its meaning, you'd need more context:

* Where did you hear it?

* What was the situation?

* What was the speaker's intention?

If you can provide more information, I might be able to help you understand what "Jau" means!