pump someone's fist

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English

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Verb

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pump someone's fist (third-person singular simple present pumps someone's fist, present participle pumping someone's fist, simple past and past participle pumped someone's fist)

  1. (informal) To perform a fist bump with someone.
  2. (slang, sex, somewhat vulgar) To thrust one's penis into another person's open fist.