Jack In: V. To Log On To A Machine Or Connect To A Network Or {BBS}, Esp.

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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
-- The AI Hackers Dictionary