One who plays guitar and is usually in a band so is therefor super cool. Guitarists are usually cooler than people that don’t play guitar and there are nearly 0 exceptions to this rule.
Usually a person who has failed in life. A Guitarist is usually a man, with no social skills who has spent most of his life in a room with other socially awkward people, as to retard his or her own social skills to the point of being only able to comunicate complex thoughts through music and old memes.
"Oh no, Jan, i won't marry him, he's a guitarist."