* A misspelling: It might be a typo of a real word. Can you provide more context or the source where you saw this word?
* A name: It could be a personal name, possibly of a specific culture or origin.
* A slang term: It might be a slang word or regional term that's not widely known.
* A fictional word: It could be a made-up word used in a specific context, such as a book, movie, or game.
Without more information, it's difficult to determine the meaning of "Yarsu".