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A little kid that plays the game Guitar Hero way too much and then thinks that they are cool because they listen to rock music. But truly, they don't know any songs other than the ones in the game.
"Man, your brother is such a guitar hero poser, he thinks he's badass because he knows one song by Megadeth."
by raven68 April 09, 2007
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Someone who thinks that because they are good at the video game Guitar Hero,they have a shred of talent with an actual guitar. They are usually mistaken.
Joey: Guys, we should jam this weekend. I just did Bark at the Moon on hard!

Lucas: Quit fagging up our oxygen with your n00bishness and idiocy, you guitar hero poser.
by Jakelikescake June 08, 2007
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