It means that during the Mid-Autumn Festival, families gather together to enjoy the moon, eat moon cakes, drink fine wine, and talk about reunion.

The following is a relevant introduction to colloquial sayings:

Various sayings are created by the masses in Chinese vocabulary and spread in the spoken language of the masses. They are colloquial and popular language units. Popular and widely popular stereotyped sentences, concise and visual, are mostly created by working people. Reflect people’s life experiences and aspirations. Common sayings, also known as common sayings and vulgar sayings, these three are synonymous.

The word "slang" has been widely used as a linguistic term; the word "shangyan" has the color of classical Chinese; the word "slang" has the flavor of spoken language. Common sayings make people's communication more convenient and interesting, and have local characteristics. ?

Slang is one of the idioms, which refers to sentences that are conventional, widely popular, and have concise images. From a broad perspective, colloquialisms include proverbs, idioms (quotations), idiomatic expressions and commonly used spoken idioms, but do not include dialect words, colloquial words, idioms in written language, or famous aphorisms in famous books.

The above information refers to Baidu Encyclopedia - Common Sayings