2sin fung 先鋒 — [vanguard] a vanguard, a office-bearer in the traditional structure of a triad society. The code number associated with this rank is 438 (triad jargon, OS).
3sin saang 先生 — [teacher] Incense Master, an official in a triad society (triad jargon), cf. heung jyu 香主 (OS).
4sin sai meih loih chin 先使未來錢 — [to spend future money in advance] to spend money one has not yet earned (e.g. by heavy use of one's credit cards).