1) A
female who gains power over a male by causing pain to his testicles (commonly "nuts"). Although it can include any kind of "
nut" attack. The
female most often employs her legs for the task, because of their relative proximity to the groin, and because the legs of a female have the needed stregnth to hurt a male without injuring him.
2) A female who humiliates, belittles, injures, chastises, dihabilitates, or otherwise causes distress to a man through non-physical means.
1) Guys ignore
Amy's reputation as a ballbuster when they see her nice legs; at least until she
kicks them in the nuts.
2) "That
Amy is a real ballbuster; not only did she kick me in the nuts under the table, she used my weakened state to make me agree to her plan."