When someone is so good at guitar they immidiately listen to a song and play it without any written music. Comes from popular anime series naruto in which ninja who possess sharingan can immidiately mimmick their opponents attacks without even seeing them.
guy one: "are you sure you're gonna be able to learn that song?"

guy two: "don't worry dude, I got ma guitar sharingan!"
by Scarab21 November 8, 2009
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