Anybody who believes they are gifted at music, when they are in fact inept. This is often associated with being a tool, and taking all personal jokes seriously even when they aren't serious.
One who wants to play Soothsayer (Buckethead) at a school talent show, when they can't even play Smoke on the Water.
alternate: The biggest tool
in the universe who fucks cats. A Jackhammer in the power tool section of home depot; cause you have to rent it, and your neighbors will hate you for it.