塘底凸 [－－－]

Jyutping tong4 dai2 dat6
Pinyin táng dǐ tū

Definitions (粵典–words.hk)
  1. 語句
    歇後語​；​下​一句​係​「​水乾至​露頭​」​，​指​某個​人平時​平日​都​唔​會​出現​，​只有​去​到​山窮​水盡​，​想​借人​錢​嘅​時​候​先​至​露面​求救
    someone who only appears when they need a favour, or when they have run out of money; literally "pool-bottom stick"

塘底凸 [－－－]

Jyutping tong4 dai2 dak6
Pinyin táng dǐ tū

Definitions (CC-CANTO)
  1. describes someone who only appears when they need a favor from others or when they are in need of money [colloquial]