* Is a misspelling: It could be a typo of a real word.
* Is a made-up word: It might be a fictional name or invented term.
* Is a word from a specific language or dialect: It's possible it's a word with a specific cultural or regional origin that is not widely known.
To understand what "Mirragong" means, you need to provide more context:
* Where did you encounter this word? (A book, website, conversation, etc.)
* What is the context surrounding the word? (What was being discussed or written about?)
With more information, I might be able to help you figure out what it means.