Runner's World. A magazine read by hydration belt wearing, gel pack eating, headlight wearing, and reflective strip wearing enthusiasts. The magazine and website is geared towards the wanna-be sub-5 hour marathoners and overweight, 50 year old moms. A complete disgrace and joke among the competitive running community.
Real Runner 1: "Dude, look at that 250 pound woman slogging her way to a 6 hour marathon."
Real Runner 2: "She must read Runner's World." (RW)
What you call a female who spends way too much time on internet socialising sites, to gain attention and internet popularity. Quite often will use PC4PC, and take photographs in peculiar places. If this is you, you're an R.W
Did you see (insert name)'s new profile picture on Facebook!? She's such an R.W!