describes two people who always stick together, hang out together and do everything together such that they are practically inseparable; normally used to describe best friends/couple/siblings
Definitions (粵典–words.hk)
名詞
比喻兩個人非常親密，成日喺埋一齊 a metaphor for a couple of lovers or friends who are exceptionally close together; literally: couple doll
佢哋成日出雙入對，好似對孖公仔咁。
佢哋成日出双入对，好似对孖公仔咁。
They always appear as a couple, as if they were a couple of dolls bound together.
近義詞
金童玉女
Definitions (Kaifangcidian)
形影不離的人 – 形影不离的人
非常要好的人
出雙入對的人 – 出双入对的人
Examples (粵典–words.hk)
Cantonese
佢哋成日出双入对，好似对孖公仔咁。
佢哋成日出雙入對，好似對孖公仔咁。
They always appear as a couple, as if they were a couple of dolls bound together.