半夜食黃瓜 [－－－黄－]

Jyutping bun3 je2 sik6 wong4 gwaa1
Pinyin bàn yè shí huáng guā

Definitions (粵典–words.hk)
  1. 語句
    唔​知頭​尾
    to​ ​not​ ​know​ ​the​ ​whole​ ​story​;​ ​to​ ​be​ ​unaware​ ​of​ ​the​ ​full​ ​situation​;​ ​to​ ​be​ ​partially​ ​in​ ​the​ ​dark​ ​about​ ​something​;​ ​literally​:​ ​to​ ​eat​ ​gourd​ ​late​ ​at​ ​night

半夜食黃瓜 [－－－黄－]

Jyutping bun3 je6 sik6 wong4 gwaa1
Pinyin bàn yè shí huáng gua

Definitions (CC-CANTO)
  1. eating a cucumber in midnight, which means not knowing where is the start and end