Deriving from cyberpunk
novels, meatspace is the world outside of the 'net-- that is to say, the real world, where you do things with your body rather than with your keyboard. William Gibson's novels (Neuromancer, Mona Lisa Overdrive, and Count Zero in particular) note the difference between the 'Net of the console cowboys and the world of the meat outside.
"For many a true computer geek, moving through meatspace is a daunting prospect."
"Simstim was a meat toy, which is why Case had never been able to get into it."