What does in-do mean in any language?

"In-do" is not a word in any widely recognized language. It's possible you might be thinking of a different word, or it could be a misspelling or a slang term specific to a particular region or group.

Could you provide more context or information? For example:

* Where did you hear this word?

* What was the context?

* What did you think it meant?

With more information, I can help you figure out what you're looking for.