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Jyutping sau3 faa1 zam2 tau4
Pinyin xiù huā zhěn tou

Definitions (CC-CANTO)
  1. Embroidered pillow; a metaphor to describe someone who is just all looks on the outside but shallow on the inside with no talents
Definitions (Wiktionary)
  1. phrase, figuratively, idiomatic
    one who is outwardly attractive but lacking ability or talent inside; just a pretty face
Examples (粵典–words.hk)
  1. Cantonese
    绣花枕头
    繡花枕頭
    sau3 faa1 zam2 tau4
    • a pillow with an embroidered pillow case