What does odg mean in slang?

"ODG" is not a common slang term. It's possible it's a specific acronym used within a particular group or context.

To figure out what it means, you'll need more information.

For example:

* Where did you see or hear this abbreviation? Was it online, in a conversation, or in a text message?

* What was the context? What were people talking about?

Once you provide more context, I can try to help you figure out what "ODG" means.