Along the same lines as a puck bunny, a ball bunny is characterized as a female, mostl likely in highschool, who comes to lacrosse games for the sole purpose of hooking up with one, or more, of the players after the game. The score, penalties, and anything else relevant to the actual game is not of interest to a ball bunny.
the act of innocently curling up in such a fashion that your upper legs touch your chest/boobs and you wrap your arms around your shins. once in a bunny ball, a person often appears cuter than they actually are. often used by young children as a technique for falling asleep.