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