Someone (typically a woman or a gay man) who does not actually rock climb, but loves to hang around the cliffs (or crags). This person may climb a little bit, but is mostly there to watch, ogle, or flirt with other climbers. Crag hags may be friends with the group of climbers, but there are some climbers who find crag hags to be annoying, lame or pretending to be something they're not.
Oh, you haven't met Sandra? She's always out at the Gunks. She doesn't climb much- she's just there to meet climber guys. She's a total crag hag.