What does the old saying "Sheng" in Cantonese mean?

It should be drinking, which means toasting in Mandarin.

In Cantonese, it is customary to take water as wealth, that is, if there is no water, in order to avoid it, it will be replaced by "victory". Similarly, "book" and homophones should also be avoided, such as winning prizes (reading) and winning prizes (all-in-one calendar).