是非根 [－－－]

Jyutping si6 fei1 gan1
Pinyin shì fēi gēn

Definitions (CC-CANTO)
  1. lit. root of trouble, meaning male's genitals
Definitions (粵典–words.hk)
  1. 名詞、舊式
    男性​生殖器​（​陰莖​）​嘅​委婉​講法​之一​（​量​詞​：​條​）
    an (obsolete) euphemism for the penis; literally, right-and-wrong root