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1.
A Hijacker could be defined as one who masturbates on a plane. This could also be considered as "sneaking into the mile high club."
Upon his return to the United States, the world traveler shares his experience of masturbating over the Atlantic Ocean. His only defense was "Who can't go 8 hours without choking it?" Phil rightfully names him the "Hijacker."
by MikeydaV May 17, 2006
 
2.
noun.
An alternate name for a boxcutter or a similar knife-like tool as used by stock persons, shipping clerks, box packers, etc.

origin:
Related to the Sept. 11th destruction of the World Trade Center by airplanes. The boxcutter was the weapon of choice used by the terrorists that hijacked the airplanes.
The blade in my hijacker is getting dull.
by dfile July 25, 2004
 
3.
One who gets high -- usually with marijuana -- and proceeds to jack off.
See that guy over there? His roommates say he's a highjacker.
by Rick February 07, 2005