搖頭擺尾 [摇头摆－]

Jyutping jiu4 tau4 baai2 mei5
Pinyin yáo tóu bǎi wěi

Definitions (CC-CEDICT)
  1. to nod one's head and wag one's tail (idiom)
  2. to be well pleased with oneself
  3. to have a lighthearted air