Being so good at a sport that you dont have to practice and you still eat up the competition. Being naturally good at any sport, most commonly basketball. Also regarding just being baller, or so cool that everything you do is something other people want to do.
Allen Iverson: "Practice, practice, I dont need to practice!!!"
Bystander/Reporter: "Wow, AI really has baller genetics."
Kid: "Damn did you see what he just did?"
Friend: "Yeah I wish I could be that cool."
Kid: "That's baller-genetics."