Mouth off

verb, slang

Definitions

Verb
  1. 1
    To complain or otherwise express oneself in a loud, immoderate manner. intransitive, slang
  2. 2
    talk in a noisy, excited, or declamatory manner wordnet
  3. 3
    To talk impudently, especially to one's superior. ambitransitive, slang

    "And don't you mouth off to me, or I'm gonna slap you right in your penis."

Etymology

From mouth + off.

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