To look at the hot chickas 'body parts' such as ass and titties.
It takes a certain skill to do it without being noticed, I myself have that skill and proud of it.
A good time waster.
Taylor was peepsin' as he walked down the hallway doing his cripple walk.
I got some good peepsin' in last night.
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.