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Sucking a lady's privates. People use it as a dirty insult, like calling a woman a muff eater to tease her about being a lesbian or a freak.
My mom called my sister a muff eater because she was making out with her best friend.
He texted me, 'You’re a muff eater, and I hate it.'
My teacher said, 'If you keep eating muff, I’ll fail you.'