What does it mean when a guy says meh?

Anonymous
Was talking to this guy and he responded to something with meh.

We'd had a little argument, and I said sorry, to which he said, all good. And then I said I was being moody. He replied with meh.

What does it mean? That he agrees but doesn't mind? Or he's ok with it?
What does it mean when a guy says meh?
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