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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 systems.
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