just like regular boners, but over guitar players. used so that if its about a male guitar player it isn't gay.
Person 1: Did you hear that guy shred?
Person 2: Yeah man, it gave me a guitar boner.
Person 1: Me too.
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To see or hear a guitar and get a boner (if the guitarist is male it is not gay)
Shit man I get a huge guitar boner every time I hear that song