【熟】【喻】煮没有米的粥，也就是只煮白开水，喻干不切实际或没有眉目的事。你实际啲得唔得，专喺度煲冇米粥！（你实际点行不行，专门弄无米之炊！）│呢件事而家仲系煲冇米粥。（这件事现在还没有盾目。）

describes the act doing something that has no positive outcome or where there is no chance of success; all talk and no trousers; to waste time discussing something that will amount to nothing