Very similar to the female queef , it occurs when air becomes trapped down the urethra and escapes. The resulting sound is a very airy whistle. Similar to wind blowing through an old building making a whistling noise.
One (male or female, inexplicable species) which devours a penis (cock) in a seven dwarf's or gym teacher-esque type fashion, reminiscent to that of whistling or blowing a whistle.
Random Frat Brother #1
"Hey, Tyler, man was that football game exquisit or what, bro? I was so wasted from all that Bud Light, totally hardcore."
Random Frat Brother #2
"Sure was, Guy. You're such a cockwhistler, now come whistle on this below average to infantile sized cock."
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.