headbanging
/ˈhedbæŋɪŋ/noun
mass noun
1- violent rhythmic shaking of the head by fans of heavy metal music（重金属乐迷有节奏的）摇头晃脑。
1.1
- violent rocking of the body and shaking or knocking of the head, by children or mentally disordered adults（儿童或精神失常的成年人的）癫狂摇晃（头或身）。