The Jargon File (version 4.4.7, 29 Dec 2003):

science-fiction fandom
 n.

    Another voluntary subculture having a very heavy overlap with hackerdom;
    most hackers read SF and/or fantasy fiction avidly, and many go to ?cons?
    (SF conventions) or are involved in fandom-connected activities such as the
    Society for Creative Anachronism. Some hacker jargon originated in SF
    fandom; see defenestration, great-wall, cyberpunk, h, ha ha only
    serious, IMHO, mundane, neep-neep, Real Soon Now. Additionally,
    the jargon terms cowboy, cyberspace, de-rezz, go flatline, ice, 
    phage, virus, wetware, wirehead, and worm originated in SF
    stories.