* It's a misspelling: There might be a similar word that you're thinking of, but have typed incorrectly.
* It's a niche term: It could be a word specific to a particular hobby, region, or community.
* It's a fictional term: It could be a made-up word from a book, movie, or other work of fiction.
Could you please provide more context about where you encountered this word? Knowing the source or the surrounding information will help me figure out what "Amatinyu" might refer to.