I'm not sure what you mean by "waigua999". This doesn't appear to be a common word or phrase in English or any major language I'm familiar with. It could be:

1. A made-up word or username

2. A typo or misspelling of something else

3. A term from a specific context or community that I'm not aware of

If you meant to ask about something specific, could you please provide more context or clarify your question? I'd be happy to help if you can give me more information about what you're trying to ask or discuss.