To seize control of (a vehicle such as an airplane or bus) by use of force, especially as a way of reaching an alternate destination or as an act of terrorism. To kidnap (a person in a vehicle): people who have experienced the trauma of being hijacked. To stop and rob (a vehicle in transit). To steal (goods) from a vehicle in transit. To take control of (something) without permission or authorization and use it for one's own purposes: dissidents who hijacked the town council; spammers who hijacked a computer network. To steal or appropriate for oneself: hijacked her story and used it in his own book.