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1.
1. The act of playing a guitar casually or mindlessly; neither practicing nor even writing.

2. Synonym of Musical Masturbation
1. "I picked up my guitar for the first time in weeks and guitfapped for like 40 minutes. It was great."

2. "Dragonforce, Dream Theater, Between the Buried and Me, and all of these Crab Core bands are nothing but guitarfap. "
by Kid In Mittens June 19, 2010