A guy who talks like he's known you his whole life even though he's never met you is a strange kind of poser.
The boy wasn't getting the attention of the kinds of guys (besides knowing what his band's name was) he wanted attention from, so he wrote lyrics about fighting with people he never met before, so that he's got their attention if he really wants it. His target didn't give him much thought before, but now thinks he's a poser.
Someone who's not really a troublemaker, but wants more than anything in the world to be accepted by the world, so does everything a troublemaker would do, thinking that being one is the answer to the question of what's wrong. A mama's boy or mama's girl posing as a rebellious teenager their entire life, well after their eighteenth birthday.
If a guy has convinced people he's Italian (such as an actor in a movie), but he's not really Italian, no matter how believable the guy is, he's not authentic, so he's a poser.
The poser had convinced people that he/she was from hell and that he/she was hell, but since there was no hell, he/she was just another otherwise obscure poser.
A term used by skaters to describe another ‘fake’ or ‘all for show’ skater. Posers usually suck at skateboarding and can quite easily get on your nerves.