Green’s Dictionary of Slang

R.L. n.

as seen from the world of computer/Internet users, the flesh-and-blood world of daily life, i.e. real life.

H. Kunzru Transmission 50: The sound emanated from a quantity of elderly computer equipment [...] in an insanely complex configuration that left space only for a futon and a wobbly operator’s chair [...] The only concession to decoration, indeed to RL lifestyle of any kind, were the posters on the wall.