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

meatspace
 /meet'spays/, n.

    The physical world, where the meat lives ? as opposed to cyberspace.
    Hackers are actually more willing to use this term than ?cyberspace?,
    because it's not speculative ? we already have a running meatspace
    implementation (the universe). Compare RL.


The Free On-line Dictionary of Computing (30 December 2018):

meatspace

    The physical world (as opposed virtual reality)
   where you might spend facetime with the carbon community.

   (1999-01-15)