Cheese Grater

Someone whose voice is so irritating and grating and dissonant that hearing is like rubbing a cheese grater up and down your face.

She's such a cheese grater.

Cheese Grater: twelve o'clock.

I hear her voice and think 'Shh shh. Your voice. My ears. Bad combination!' (Thanks Sleep Talkin' Man) Her new nickname is Cheese Grater.

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