I don’t know that I’ve ever heard anyone use the interjection, meh.
Used as an expression of boredom or indifference, meh is supposedly the verbal equivalent of shrugging on one’s shoulders.
Meh was apparently popularized after its use in the animated TV series The Simpsons. I can quite happily say that I have never watched a single episode of that show, now in its 29th. No particular reason for it – we’ve both caught glimpses of it here and there as we’ve changed channels or it’s been mentioned in some other show – but neither of us have had any particular reason to watch – meh…….
A humorous definition is found on T-shirts available from Amazon: “Meh – the universal, non-committal answer to every question ever posed. It’s the answer that doesn’t actually give any answer.”
Merriam-Webster definition of meh: used to express indifference or mild disappointment.