A person who whispers unnesassarily, in an attempt to be discreet, but usually ends up drawing negative attention to himself, and the uninvolved victim which he choosed to whisper to. In the process, the horse-whisperer usually violates personal space.
Used as a verb:
Girl- "Why were you and Vinnie whispering about me when I walked by? It was SO obvious!"
Innocent Bystandard- "What? I had no idea what he was even talking about, that fool just Horse-Whispered me outta nowhere!?!"
Used as an adjective:
#1- "What was Vinnie just whispering to you about?"
#2- "I have no idea, I wasn't paying attention... but I guess that's why they call him the horse-whisperer."
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.