(slang) someone is overstay in a party and never want to leaves.
Definitions (粵典–words.hk)
名詞
形容一個人去人哋屋企做客時久坐不去，就好似個屎忽黐住張櫈咁；一坐低就唔願郁 someone who comes to visit and overstays their welcome; someone who is unwilling to leave; literally: sticky rice arse