A wooden box that originated in the 16th century made to sound like a dying cat. Often times the cat can be removed from the box, leaving behind the skeleton of a violin.
An adolescent. Derived from Shakespeare's Twelfth Night, specifically from Malvolio's description of Viola in Act 1 Scene 5: "Not yet old enough for a man, nor young enough for a boy..."
A big violin, invented in order to make violins feel like they're any good.
Violin 1: Hey dude, you know what's the difference between a viola and a vacuum cleaner?
Violin 2: I don't, what is it?
Violin 1: You have to turn the vacuum cleaner ON before it can SUCK