The defining word of a person whom steals the significant other from someone else only so the "car Jacker" can be with the person whom was stolen. Find a person whom you, the car jacker, want to be with, then procced to "steal" that person from the one whom they are already engaged in a relationship with, causing them to break up and then moving in to build a relationship with the person the car jacker choose to steal.
That duche bag Chris is such a car jacker, he stole my girl right out of my arms!!
used mostly for someone giving a handjob while riding in a car
Man jennifer is such a car jacker! Did you hear about her carride with will last year?