煠熟狗頭 [－－－头]

Jyutping saap6 suk6 gau2 tau4
Pinyin zhá shú gǒu tóu

Definitions (粵典–words.hk)
  1. 形容詞、俚語
    形容​人擘​大個​口​笑​得​好​開心​，​笑​到​見​牙​唔​見​眼​，​好似​煮熟​嘅​狗​頭​噉
    used to describe someone who grins stupidly; literally, boiled dog head, because you can only see the teeth but not the eyes of a cooked dog head which resembles how someone laughs
    • 做乜烚熟狗頭噉嘅？陳生又講笑話？
      做乜烚熟狗头噉嘅？陈生又讲笑话？
      zou6 mat1 saap6 suk6 gau2 tau4 gam2 ge2? can4 saang1 jau6 gong2 siu3 waa2?
      What's the laughing about? Mr. Chan is telling jokes again?
  2. 參看
    烚熟狗頭、熠熟狗頭
Definitions (Wiktionary)
  1. noun, Cantonese
    Used in comparisons to describe a large and cheesy (often false) grin.

煠熟狗頭 [－－－头]

Jyutping zaa3 suk6 gau2 tau4
Pinyin yè shú gǒu tóu

Definitions (CC-CANTO)
  1. laugh like a fool with mouth wide open and eyes closed (slang)