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Jyutping seoi1 gwo3 tau1 maau1
Pinyin shuāi guò tōu māo

Definitions (CC-CANTO)
  1. very bad; very nasty
Definitions (粵典–words.hk)
  1. 形容詞
    冇​出息​,​做​唔​成​大事​。
    Literally "worse than a thief who steals cats", figuratively "unable to achieve anything great".
    • 阿松呢個毒男禮拜六日淨係識得匿喺屋企睇萌娘動畫,真係衰過偷貓!
      阿松呢个毒男礼拜六日净系识得匿喺屋企睇萌娘动画,真系衰过偷猫!
      On weekends, the nerd A-chung does nothing but hide at home to watch anime with moe girls. What a failure!
Examples (粵典–words.hk)
  1. Cantonese
    阿松呢个毒男礼拜六日净系识得匿喺屋企睇萌娘动画,真系衰过偷猫!
    阿松呢個毒男禮拜六日淨係識得匿喺屋企睇萌娘動畫,真係衰過偷貓!
    • On weekends, the nerd A-chung does nothing but hide at home to watch anime with moe girls. What a failure!