2sí hāang gūng maaih chóu jí → mahn sām 屎坑公賣紙絲 → 閣心 — [toilet attendant selling toilet paper → trustworthy] to be trustworthy, to need to be honest, often used as an instruction or warning (since a toilet attendant is not supervised he ought to be trustworthy).
3sí hāang gwāan dōu → màhn yauh inh dāk móuh yauh joh dāk 屎坑關刀 → 聞又吽得聞又吽得 — [toilet pipe chopper → can't be smelled or danced with] someone with no talent (since màhn 聞 puns with màhn 又 "learning", and móuh 舞 "to dance" puns with móuh 武 "martial arts", so that the person is described as lacking both intellectual and physical skills).
4sí hāang kiu 屎坑橋 — a low scheme or trick (kcyg, 9).