A hand in poker which comprises of a Jack and a King of different suits. When combined the hand could be described as being Jack-King-Offsuit, often abbreviated to jack-king-off. This sounds like jacking off, a common past time of bachelors supposedly.
The act of grabbing a woman's breast, instead of the usual handshake. Then as she raises her hand to slap you in the face high five her. Walk away like a fuckingbadass.
Joe: I got a restraining order filed against me.
Bob: Why?!
Joe: I gave a bachelor's handshake at the club last night.
Bob: Woah! You're such a badass
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.