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.