1. (slang) high on drugs or stimulants.
2. (slang) broken, imperfect, especially when followed by 'up'. (See jacked up)
- This computer is so jacked up, I'm surprised it can still turn on!
3. (slang) strong and/or muscled.
- Wow, that guy is jacked!
1. (slang) simple past tense and past participle of jack (stole)
- Dude, he just jacked my bike!