粤典 (words.hk)香港短语
歇後語：問心。以前啲人去完廁所係唔係用廁紙而係用草紙，而呢啲草紙通常唔係免費，所以「屎坑公」，即係舊時嘅廁所清潔工，會響廁所門口疊草紙隔籬擺個箱等人入錢落去。草紙同錢箱都係無人看管，入唔入錢都全憑啲人嘅自覺，所以就引申到咁嘅意思。 (to appeal to one's conscience; to need to be honest, often used as an instruction or warning; literally: toilet attendant selling toilet paper)
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