Other forms: carjacking; carjacked; carjacks
To carjack is to forcefully steal an occupied car from its driver. Sometimes a person who carjacks instructs the victim to drive somewhere.
As opposed to a car thief who takes an unoccupied car from a parking lot or street, someone who carjacks might force his way into a car stopped at a red light. A person who commits this crime is called a carjacker. The word carjack is relatively new, dating only from the 1990s when the crime was rampant in certain cities. It combines car and hijack, "stealing a plane or ship while in transit."