Another term for a double bass, acoustic bass, or bass fiddle. It's the largest of the string instruments (resembling a giant violin) and lowest-sounding instrument found in an orchestra. Can be played with a bow or plucked with the fingers. The word "upright" means that it is to be played while standing up while holding the instrument upright, as opposed to how a bass guitar is held (on the lap or at a 45 degree angle). Also not to be confused with the cello, which is smaller and played while sitting down.
Paul Chambers and RonCarter each played the upright bass at one time or another for Miles Davis.
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.