used to describe leftover goods (or people) that no one wants that are of inferior quality; it is often used as a derogatory term to refer to women who are the “Leftover Women” and unwanted by men [colloquial]
Definitions (粵典–words.hk)
名詞、俚語
冇用或者冇人要嘅嘢，可以指無用嘅工具或者嫁唔出嘅女人 someone or something unwanted left over, left behind; literally, orange / mandarin orange at the bottom of a basket
呢隻牌子自從俾人踢爆用假料之後，佢啲產品就變晒做蘿底橙。
呢只牌子自从俾人踢爆用假料之后，佢啲产品就变晒做萝底橙。
ni1 zek3 paai4 zi2 zi6 cung4 bei2 jan4 tek3 baau3 jung6 gaa2 liu2 zi1 hau6, keoi5 di1 caan2 ban2 zau6 bin3 saai3 zou6 lo4 dai2 caang2. After the scandal of using of fake materials was exposed, no one wants the products of this brand anymore.