Top definition
The sometimes shady process of aquiring new friends on Myspace from other people's friends list.
Example #1:
Space-Jacker #1: "Man, did you see that chick on Jeremie's profile?"

Space-Jacker #2: "Yeah, that bitch is pretty fuckin fine. I think imma have to space-jack her."

Space-Jacker #1: "Man I went space-jacking last night, and picked up like 23 new bitches...allllll fine as fuck. yeahhhhh man."
by ODUB December 20, 2008
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