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Computing (FOLDOC) dictionary
jack in
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To log on to a machine or connect to a network or BBS,
especially 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.