老鼠尾生瘡 [－－－－疮]

Jyutping lou5 syu2 mei5 saang1 cong1
Pinyin lǎo shǔ wěi shēng chuāng

Definitions (粵典–words.hk)
  1. 語句
    歇後語​，​大極​有限
    sandwich pun