An instrument belonging to the bowed string family that resembles the common viola in size and shape. A notable exception is in the setup of the strings. Instead of four tuned steel strings, the graybola features only a single string, untuned, and comprised of a single, long strand of ass-hair. The graybola was made famous by rising folk prodigy, Zachary Addison. The instrument was most notably used in Addison's hit single, "Over the Hill."
Ted: "What is that pure and true instrument I justheard?"
Bill: "That would be the Graybola!"
GoWax Your Balls
Basically the same meaning as GFY, but worse as the pain induced when waxing balls would be worse than any other experienced by a guy - along with possibly very humiliating.
When in a heated text argument, Stella got angry with Jack and sent a text including "GWYB" to end the conversation, telling Jack to Go Wax His Balls.