* Is a misspelling: Perhaps it's meant to be another word or acronym.
* Is a slang term: It might be a slang term specific to a particular group or region.
* Is a code or abbreviation: It could be a code used within a specific context (like a company or organization).
To figure out the meaning, you need more context. For example:
* Where did you see it? (A website, a chat, a document)
* What was the surrounding text?
With more information, I might be able to help you decipher the meaning of "gdhu."