Something a girl does to a boy to either get her way or take revenge for a previous discrepancy. Despite the term "kick" included in the phrase, it can be used to describe any method in which a girl uses her legs to gain a physical advantage over a boy, limited to attacking his nuts. She may use her knee or thigh to overpower her male opponent. Also deployed by males to males, but everyone knows it hurts more when a girl administers it.
1(To get her way): I wouldn't let Amy do it her way, but my tune changed when she kicked me in the nuts under the table.
2(To take revenge): He never made fun of Amy again, after she kneed him in the nuts.
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."