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To masturbate vigorously, as if romancing one's beloved guitar. Common among musicians and college freshmen.
Bro: "Man, some nights I love to just lie in bed and smash the guitar."

Everyone Else: "Ewwww." (Alternate response: "We knew, we can hear you!")
by rock out with yo cock out March 08, 2014

Words related to smash the guitar

college guitar jack off masturbation music