咬指伸舌yǎo zhǐ shēn shé

bite one’s fingers and stick out one’s tongue—say in astonishment
❍ 一个个～道： “爷爷呀！ 这般重，亏你怎的拿来也！”(《西游记》37)Biting their fingers and sticking out their tongues they said:“Grandpa,it’s so heavy,how can you possibly lift it? ”