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Jyutping gau2 tau4 gwan1 si1
Pinyin gǒu tóu jūn shī

Definitions (CC-CEDICT)
  1. (derog.) inept advisor
  2. a good-for-nothing adviser
  3. one who offers bad advice
Definitions (粵典–words.hk)
  1. 名詞
    鍾​意出​謀獻策​不過​出親​都​係​屎​橋​嘅​人
    someone who keeps giving bad advice; literally: dog-head military adviser
    • 網上面啲狗頭軍師自以為好聰明。
      网上面啲狗头军师自以为好聪明。
      mong5 soeng6 min6 di1 gau2 tau4 gwan1 si1 zi6 ji5 wai4 hou2 cung1 ming4.
      Those who often give bad advice online think they are smart.
Definitions (Wiktionary)
  1. phrase, idiomatic
    an incompetent person who likes to give suggestions to others
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    网上面啲狗头军师自以为好聪明。
    網上面啲狗頭軍師自以為好聰明。
    mong5 soeng6 min6 di1 gau2 tau4 gwan1 si1 zi6 ji5 wai4 hou2 cung1 ming4.
    • Those who often give bad advice online think they are smart.