yáo​tóu​huàng​nǎo

to sway one's head

摇头晃脑 搖頭晃腦 yáo​tóu​huàng​nǎo
to sway one's head
to wag or bob one's head from side to side, often in time to music or while reading
self-satisfied
describing an air of being self-satisfied, smug, or lost in one's own enjoyment

Frequency

Movie subtitles
0.180 per million appears in 0% of films
Written text
0.663 per million

Sources