What does hyd mean in texting?

I'm curious, what does the abbreviation 'hyd' stand for when used in texting? Is it a common term among young people or is it specific to a certain group or community? I've seen it a few times but I'm not sure what it means and I'm eager to learn more about the latest slang and trends in messaging. Could you help me out with the definition and maybe some context on how it's typically used?