A person who finds guestbooks with no entries on social networking sites such as Netlog and 'bags' them by being first to comment. Usually done to, mistakenly, increase their self-worth.
Scratching around on Netlog last night, that TurkStud100002 is a right Guestbook bagger- he's beaten me to all the new profiles!
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.