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Jyutping sei2 gu1 gu1
Pinyin sǐ gū gū

Definitions (Wiktionary)
  1. adj, Cantonese, ideophonic
    slow-witted

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Jyutping sei2 gu4 gu4
Pinyin sǐ gū gū

Definitions (粵典–words.hk)
  1. 形容詞
    對​外界​冇​乜​反應​;​冇​嚟​生氣
    slow-witted; dull; idle
    • 你今日死咕咕咁嘅樣,尋晚唔夠訓?
      你今日死咕咕咁嘅样,寻晚唔够训?
      nei5 gam1 jat6 sei2 gu4 gu4 gam2 ge3 joeng2, cam4 maan5 m4 gau3 fan3?
      You look so dull today, did you sleep well last night?
  2. 形容詞
    食古不化​、​唔​識​變通​;​唔​靈活​;​死板
    stubborn; inflexible, rigid; bigoted
    • 做人唔好死咕咕,轉下彎啦。
      做人唔好死咕咕,转下弯啦。
      zou6 jan4 m4 hou2 sei2 gu4 gu4, zyun3 haa5 waan1 laa1.
      Don't be so stubborn, try to think outside the box?
  3. 參看
    死古古、死固固

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Jyutping sei2 gu1 gu1
Pinyin sǐ gū gu

Definitions (CC-CANTO)
  1. inflexible; boring (spoken)
Examples (粵典–words.hk)
  1. Cantonese
    你今日死咕咕咁嘅样,寻晚唔够训?
    你今日死咕咕咁嘅樣,尋晚唔夠訓?
    nei5 gam1 jat6 sei2 gu4 gu4 gam2 ge3 joeng2, cam4 maan5 m4 gau3 fan3?
    • You look so dull today, did you sleep well last night?
  2. Cantonese
    做人唔好死咕咕,转下弯啦。
    做人唔好死咕咕,轉下彎啦。
    zou6 jan4 m4 hou2 sei2 gu4 gu4, zyun3 haa5 waan1 laa1.
    • Don't be so stubborn, try to think outside the box?