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Phrase(s): (Do) you eat with that mouth? [and] (Do) you kiss your momma with that mouth?
Sl. Do you actually eat with the mouth you use to talk that filth?; Do you actually use that filthy mouth to kiss your mother? (A phrase said to someone who talks dirty all the time.) • That’s a lot of foul talk. Do you eat with that mouth? • After the suspect finished swearing at him, the police officer said, "Do you kiss your momma with that mouth?"
McGrawhill's American Idioms And Phrasal Verbs