Definition of jacked adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈdʒækt//
    ; NAmE NAmE//ˈdʒækt//
    (also jacked up) (especially North American English, informal)
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  1. 1feeling more awake or having more energy because of the effects of a drug or a similar substance I think she was jacked on caffeine because she wouldn't stop talking.
  2. 2(of a person) having big muscles How does he maintain his jacked physique?

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