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
(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.