陰陰嘴笑 [阴阴－－]

Jyutping jam1 jam1 zeoi2 siu3
Pinyin yīn yīn zuǐ xiào

Definitions (CC-CANTO)
  1. to snigger; to snicker; to smirk
Definitions (粵典–words.hk)
  1. 動詞
    忍住​咁​笑​、​偷笑
    to suppress a smile; to smirk