an incapable person who always gives useless advice (slang)
Definitions (粵典–words.hk)
名詞
指中意幫人出屎橋嘅人。又作「紅鬚師爺」。 an unsatisfactory strategist
佢係個紅鬚軍師,成日幫人出啲屎橋。
佢系个红须军师,成日帮人出啲屎桥。
keoi5 hai6 go3 hung4 sou1 gwan1 si1, sing4 jat6 bong1 jan4 ceot1 di1 si2 kiu2 He is an unsatisfactory strategist, proposing bad suggestions all the time.