carjack

from WordNet (r) 3.0 (2006)

carjack
    v 1: take someone's car from him by force, usually with the
         intention of stealing it; "My car was carjacked last
         night!"

from The Collaborative International Dictionary of English v.0.48

carjack \carjack\ v. t. [car + hijack.]
   to take (a car) by an act of {carjacking}; as, the three
   teens carjacked two automobiles in one night.
   [PJC]

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