Basically a really fancy name for something most straight guys, and some girls have; a fetish for boobs. Mazophilia is the clinical term for when any particular person is sexually stimulated by female breasts, and is probably one of the most universal fetishes among straight men and teenage boys.
Nurse with cleavage: "our test resultsshow you have an extreme case of Mazophilia"
Patient:"huh?"
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.