jacked up adjective 9forms 4 adjective9 •Hoisted, lifted off the ground, or propped up using a jack.Do you want to rotate the tires while we have the car jacked up? •(informal) Significantly increased or expanded.It's hard to make ends meet with the jacked up price of gas.The new jacked up triple-barrel cannons helped turn the tide of the war. •(slang) Under the influence of stimulants; high.They were all jacked up on coke. •(slang) Stimulated, excited.Late summer is going to be a fantastic time to be a metal fan and we′re more jacked-up about it than a truckload of nymphomaniacs let loose in a dildo factory. — 2002 •(slang) Describes a 4x4 automobile that has a "lift kit", raising the body and/or frame higher than stock.He took us for a ride in his awesome new jacked up truck. •(slang) Wrecked; damaged; ruined; injured.That jacked up refrigerator hasn't moved from that curb in months.My elbow is all jacked up from playing tennis. •(slang) Reprehensible; objectionable.Dude, your girlfriend left you for your brother? That's jacked up. •(dialect, no longer used) Bankrupt; insolvent; ruined; done for. •(dialect, no longer used) Absent, having quit, given up, or having abandoned one's post. formsmore jacked up · more jacked-up · most jacked up · most jacked-up