* It's a misspelling. Perhaps you meant a similar-sounding word like "kiwi" or "key."
* It's a slang term or regional dialect word. If you heard it used in a specific context, let me know and I might be able to help.
* It's a made-up word. Maybe it's a name or part of a fictional story.
Please provide more information so I can help you figure out what "kihii" means.