Plain and simple: an anemometer.
An anemometer is an instrument used for measuring wind speed.
Winds were clocked with my stupid sodding "rotten cat pee yellow" portable digital "windometer" (as JD from JD Quad in the UK calls them even though those things are actually called, "anemometers") ;-) as being variable to 3.60mph (4.36kph) at the surface.
A scale in which a WTF is measured, usuall from 1 (worst) to 10 (best). Mostly used by 1337uber geeks who play unreal tournament, lolcats and other extreme creatures
Person: " OMG! that scored a 7.6 on the wtfometer!"
Person: "You're so gay you score a 2.3 on the wtfometer! k thx bye!"
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.