be a loud mouth(redirected from am a loudmouth)
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be a loud mouth
To have a tendency or habit of speaking incessantly, indiscreetly, and/or in a noisy, boastful manner. I can't stand Terry's new husband—he's such a loud mouth when he drinks! If I had known you were such a loud mouth, I'd have never shared my secret with you!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.