Green’s Dictionary of Slang

(US) hijacking an automobile, or robbing its driver.

1997		G. Sikes 8 Ball Chicks (1998) 211: A girl was preparing to testify against a Latin King for car-jacking an elderly woman at gunpoint.
2003		T. Dorsey Stingray Shuffle 1: Carjackings, exploitation of the elderly, cigarette boats running from the Coast Guard [etc.].