九淺一深 [－浅－－]

Jyutping gau2 cin2 jat1 sam1
Pinyin jiǔ qiǎn yī shēn

Definitions (粵典–words.hk)
  1. 名詞
    性愛​技巧​，​意思​係​性器官​抽插​嘅​時​候​，​要​淺​插九下​，​深插​一下
    the 'nine shallow one deep' thrusting method