Jacked up
Jacked up turns up in 2 fields: automotive, shop slang. Here is what it means to the people in each one.
Jacked up in automotive
A vehicle modified with a suspension lift kit to drastically increase ground clearance.
A jacked up truck or SUV has aftermarket suspension components installed to raise the frame and body higher than the factory ride height. This modification allows for oversized tires and improves off-road approach angles, but raises the center of gravity and alters driveline geometry. Installers must often drop the transfer case or extend driveshafts to compensate.
"He brought in a jacked up Silverado and now complains about a driveline vibration at highway speeds."
Jacked up in shop slang
Severely damaged, incorrectly assembled, or thoroughly reprimanded.
Originally a military term for receiving a harsh scolding from a superior, this phrase crossed into civilian shops to describe anything in a state of chaos. It applies equally to a worker who made a massive blunder and to the broken machinery they caused. A piece of equipment described this way usually requires extensive repair or total replacement.
"Don't turn on that lathe until maintenance clears it because the spindle bearings are completely jacked up."