What does idd mean in slang?

"Idd" is not a commonly recognized slang term. It's possible it's a misspelling or abbreviation of something else, or it might be specific to a certain region or group.

To help me understand what you're looking for, could you provide more context?

For example:

* Where did you see "idd" used? (Online chat, in person, etc.)

* What was the surrounding conversation?

* What language or dialect was it used in?

With more information, I can give you a more accurate answer!