摇头晃脑
yáo​tóu​huàng​nǎo

to sway one's head

  1. 摇 搖 yáo verb
    to shake
    to shake, rock, or wave; to move back and forth or to make something move back and forth
  2. 头 頭 tóu noun
    head
    the head of a human or animal; hair or hairstyle
  3. 晃 huàng verb
    to sway
    to sway; to shake; to rock from side to side; to wander about
  4. 脑 腦 nǎo nounlocative
    head
    (bound form) The head; often used in phrases describing head movements or appearances.