What do you mean by "bye-bye" in the vernacular?

In fact, this sentence comes from a dialogue in an advertisement, which is a paint advertisement. There are four-legged parties and one? The dog broke its tail because of an accident. The big dog in the advertisement said, Bye-bye, you have a tail! You may find this sentence interesting after receiving it from a TV advertisement, and it will be interesting to meet friends or other people to join the conversation in the future. As soon as this sentence gets around, it will be a shame for others to say that you don't talk. This has become the mantra of men, women and children.