What is grumble grumble?

Usually said when one feels annoyed or frusturated

"I totally failed that test! Grumble grumble..."

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grumble grumble - video

Grumble grumble - what is it?

A saying spoken by someone who is discontent.

A - What's going on, B?
B - Grumble grumble.
A - I get it, I'll leave you alone.

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