唔做中，唔做保，唔做媒人三代好 [－－－－－－－－－－－－－－－]

Jyutping m4 zou6 zung1 m4 zou6 bou2 m4 zou6 mui4 jan4 saam1 doi6 hou2
Pinyin wú zuò zhōng ， wú zuò bǎo ， wú zuò méi rén sān dài hǎo

Definitions (粵典–words.hk)
  1. 語句、俚語
    中即​係​中間​人​，​雙方​有​咩​唔​滿意​都​會​怪罪​佢​度​；​保即​係​債務擔​保人​，​債仔​唔​還錢​就要​你​去還​；​媒人​就​幫人​結緣​，​兩​夫妻​有​咩​不​和​，​佢​哋​兩​邊​嘅​家庭​都​會​賴落​媒人​。​呢​啲​同人​做​中介​嘅​職​種​吃力​不討​好​，​往往​賺​嘅​少​，​一有​咩​事​自己​又​會​搞​到​損手爛​腳​，​所以​少​掂​為​妙
    a warning as to not to act as a mediator or meddle with other people's business; literally: do not act as a middleman, a guarantor, or a matchmaker, then your family will prosper for three generations