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jack in

jack in: v. To log on to a machine or connect to a network or
   BBS, esp. for purposes of entering a virtual reality
   simulation such as a MUD or IRC (leaving is "jacking
   out").  This term derives from cyberpunk SF, in which it was
   used for the act of plugging an electrode set into neural sockets
   in order to interface the brain directly to a virtual reality.
   It is primarily used by MUD and IRC fans and younger hackers on BBS