Simple past tense and past participle of carjack.(verb)
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Use "carjacked" in a sentence
"After a masked-man with a gun first carjacked a white 1993 Jeep Cherokee on Aurora's northeast side at about 5: 19pm on Thursday, he then proceeded to the drive-up window at Harris Bank at 2853 Kirk Road (Farnsworth), demanding cash and pointing a gun at the teller."
"In a Twitter update, Hartman wrote: "Just escaped after being carjacked at a checkpoint and driven to a compound where men surrounded the car and threatened to behead us.""
"He then carjacked another vehicle and stabbed another driver, then hit a pedestrian as he escaped."