It's possible that the person intended to write something else, or they might be using a slang term or a personal idiom that isn't widely known.
To understand the intended meaning, you would need more context.
Could you please provide more information about where you encountered this phrase?
For example:
* What was the full sentence or conversation?
* Who said it?
* What was the situation?
This will help me understand what "yo wan" might mean in that specific context.