Noun: A giant douche-bag that enjoys posting feed after feed about his awesome life you wish you had. May possibly be, but not limited to, an over-muscular guy that has girls hanging off his eight pack who goes to every awesome party you weren't invited to, or an event you wish happened to you.
Daniel: Man, did you see Tim's post about hooking up with the hottest chick at that frat party?
John: Yeah! He also posted about that massive inheritence of 10 million from his dead aunt.