【喻】原指粘連在一起的兩個泥人兒（一種玩具），喻非常要好、形影不離的一對朋友（孖：兩物粘連；公仔：小人兒）。

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