noun informal
1. a young person, esp. a teenage girl, who is an ardent admirer of rock musicians and may follow them on twitter.
2. an ardent fan of a celebrity or of a particular activity
3. a dumbass person who follows celebs on twitter and thinks their really friends with them and writes on their walls and expects responses..

And yes Errisson did come up with this first.

When you eat dirt for the first time and leave your family to build a shack in the woods