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Reference : Phrasal Verbs : J : jack off

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jack off Informal Vulgar

Meaning: If a guy jacks off, he masturbates and has an orgasm.

Synonym: jerk off (informal), masturbate

For example:

  • jack off Most boys start jacking off when they're about twelve or thirteen.

  • jack off Some Christians used to think it was a sin to jack off, and some priests would even scare boys by telling them they'd go to hell if they did it.

Quick Quiz:

A lot of guys jack off
  1. on trains
  2. in gyms
  3. in the shower

Grammar explanation: separable and non-separable phrasal verbs

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