懂中文 Dong Chinese

點頭咂嘴

diǎn​tóu​zā​zuǐ

to approve by nodding one's head and smacking one's lips

Definitions

点头咂嘴 (點頭咂嘴) 

diǎn​tóu​zā​zuǐ

to approve by nodding one's head and smacking one's lips (idiom)

Sources