The phenomenon that takes place when a sexually aroused male experiences a sudden or gradual rush of blood to the penis causing it to stand stiff and harden, often occuring unexpectedly in a public setting.
I always pop a boner every time I see your mom bend over
I popped a boner in Miss Goodbody's math class just before she asked me to solve a problem on the board
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.