The look of sheer ecstacy on one's face while playing a guitar solo - usually triggered by a long, sustained note or bend. Looks very similar to the person's o face
"Dude, check out Miles. He's having a guitargasm."
"I was playing a JEM through a Peavey JSX the other day. I almost had a guitargasm on the spot - didn't even have to take me out to dinner."
© 1999-2015 Urban Dictionary ®
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