Carjacking is the crime of stealing a motor vehicle when the vehicle is occupied. Typically, the carjacker is armed, and the driver is forced out of the car at gunpoint. The word is a portmanteau of car and hijacking
A carjacking is an attack on a person who is driving their own car during which things may be stolen or they may be harmed physically. the crime of using a weapon to force the driver of a car to drive you somewhere or give you their car hijacking (car + highjacking)