What is belliwelli?

There's no widely known or established word or term "belliwelli." It's possible:

• It's a misspelling: Could you be thinking of a similar-sounding word? If you can provide more context (where you heard/saw it, what it was referring to), I might be able to offer a better guess.
• It's a proper noun: It might be a less common place name, a person's name, or the name of a company or product. Again, more context would be helpful.
• It's a newly coined word or slang: New words and slang terms are constantly emerging, particularly online. If it's very recent, it might not yet be in any dictionaries.
• It's a fictional word: It could be from a book, movie, game, or other work of fiction.

Please provide more details so I can assist you better.