This is a vulgar language with the meaning of swearing.
The explanation contains many meanings, and people in different places may have different understandings of it.
For some places, "not eating four dishes" means eating only three dishes, while in our folk culture, three dishes refer to sacrifices placed on the altar. If you can't eat four dishes in this life, you can only eat three dishes, which means that someone eats sacrifices, which means calling someone dead.
This sentence also means to look down on people and call them names for living in poverty. Because some people are used to cooking four dishes and one soup at home, saying that they can't eat four dishes in their lives, that is to say, they are poor and incompetent, and they can't even afford four dishes at home.
In China's folk culture, there is a rule that three dishes are not served on the table and six people are not seated. Three dishes represent "the meal of the dead" and are only used when offering sacrifices. In ancient times, before the condemned prisoners were about to be beheaded, they ate three or five dishes, so cursing people could not eat four dishes in their lives, which actually meant cursing people for their early death.
Extended data:
There is another saying that has more connotation.
The four dishes refer to: the full moon dish at birth, the wedding dish at the time of getting married, the parting dish of Xie Shishi, and the tribute dish at the time of memorial service.
Although these dishes are related to myself, the dishes on the table are beyond my own consumption. The first dish is my own full moon wine, which is still a baby. Of course, this dish can't be eaten by myself.
The second dish is their own wedding wine. The newlyweds are very busy with the wedding. They have to greet too many relatives and friends and toast the guests at the banquet, so there is no time to eat this dish.
The third dish is the tofu feast after his death, because he has already left, so he can't eat it;
The fourth is a tribute to the deceased, but of course the deceased can't enjoy it.
The extended meaning means cursing someone: the full moon can't be reached, people can't get married, no one cares when they die, and no one pays homage when they die.