feeling more active or having more energy because of the effects of a drug or a similar substance (因药物等作用而)亢奋的 I think she was jacked on caffeine because she wouldn't stop talking. 我想是咖啡因让她精神亢奋,因为她一直说个不停。
(of a person) having big muscles (人)肌肉发达的 How does he maintain his jacked physique? 他是如何保持他被劫持的体格的?