Ball-poppin' 

Ball-poppin', Ball-pop, Ball-popper, or Ball-popped. A new, contemporary, post-2008 term (usually a masculine one) that can be used to casually refer to someone who can simply be categorized as, stud (in a good way). In most cases, though not always, it is a person who womanizes intuitively, and is not cocky about it.
Everyone (99% of his personal circle of friends, and more than 55% of his friends of friends) thinks that he is cool; they enjoy his company, particularly the female ones.
Please note that, the term is not related to a man literally inserting his scrotum in/out of a woman's mouth when he is plowing her. Even if she is making pop-like sound in the process.

Guy A: What's up, you ball-poppin'?
Guy B: You know it!

Guy C: Just look at (Guy B), chillin' with those hot girls like he doesn't even care if they have boyfriends or not.
Guy D: He's such a ball-popper.

Guy E: Hey, (Guy B)?
Guy B: 'Sup?
Guy E: Where were you yesterday, you did not show up in our group meeting?
Guy B: Sorry dude. I ball-popped all afternoon, so I forgot all about it. I won't forget to come in the next ones.

Ball-poppin' by kaostheory519 April 9, 2009

Ball-Popping 

When one suckles on the scrotom sack, ever so gently, then pulls back just enough to create a popping sound when the testicle exits the mouth.

He was a very good boy so I rewarded him with a ball-popping good time!

Ball-Popping by Dirt Star November 18, 2003