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1. To increase sharply. Please stop jacking up the volume on the TV. I can barely hear myself think.
2. To raise something through the use of a jack, a simple machine used to lift things. We'll need to jack up the car before we can change this tire.
3. To stimulate, excite, or motivate, often but not always through the use of drugs. In this usage, a noun or pronoun is sometimes used between "jack" and "up." By the way he was flitting around, you could tell the guy was jacked up on something. This soundtrack jacks me up so much when I'm working out.
4. To inflict damage upon, physically or otherwise. In this usage, a noun or pronoun is sometimes used between "jack" and "up." Yikes, that car wash really jacked up your car's exterior. I'm not going to lie, that horror movie jacked me up for weeks.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
jack someone up
1. Sl. to excite or stimulate someone, possibly with drugs. Tom jacked up his buddy by talking to him. Tom jacked up Fred with a lot of encouragement.
2. Sl. to motivate someone; to stimulate someone to do something. The mail is late again today. We'll have to jack those people up at the post office. I guess I'll have to jack up the carpenter again to repair my stairs.
jack something up
1. Lit. to raise something up on a mechanical lifting device. Now I have to jack the car up, so I can change the tire. Please jack up the car.
2. Fig. to raise the price of something. The store keeps jacking prices up. The grocery store jacked up the prices again last night.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Raise or increase, as in The cartel is jacking up oil prices again. This term alludes to the literal meaning of jack up, that is, "hoist with a jack." [Colloquial; c. 1900]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. To lift something, especially a vehicle, using a jack: We jacked up the car to change the tire. I hurt my arm when I jacked the van up.
2. To raise some price or value by increments: Because of the drought, the stores jacked up the price of lettuce. That candidate is going to jack taxes up after the election.
3. To stimulate someone with or as if with a drug: My friend jacked me up on caffeine the night before exams. The coach jacked up the team with a pep talk before the game.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
jack someone up
1. tv. to motivate someone; to stimulate someone to do something. I’ll jack him up and try to get some action out of him.
2. tv. to beat or stab someone. (Underworld.) They really jacked up Bobby. He almost died.
jack something up
1. tv. to raise the price of something. They kept jacking the price up with various charges, so I walked.
2. tv. to mess something up. Who jacked up the papers on my desk?
1. and jacked mod. excited. I was so jacked I almost passed out. Don was really jacked up about the election.
2. mod. arrested. (Underworld.) What time did Sam get himself jacked up?
3. mod. upset; stressed. I was really jacked up by the bad news.
4. mod. high on drugs. He’s jacked up, and he may have ODed.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.