Someone who insist on telling you where to go, how to get something or how to complete a level while you're playing.
"hey you forgot to go get the key too unlock that door" "hey man i was going to, god stop being such a backseat gamer"
someone who does nothing but talk about guitars, talks about playing guitars, looks up shit about guitars, and hates guitar hero. doesn't even necessarily play guitar.
Guy 1: omg hey man have you seen gibsons new robot guitar?
guy 2: no i havent go away.
guy 1: aww man i played it last week, it ruled.
guy 2: GO AWAY.
guy 1: hold on im gonna find it on google and show you
guy 2: guy 1 your such a damn guitar junkie GO AWAY NOW