拜拜。

You use it exactly like you use 'bye' in English. You can say it once or twice. Saying it twice as 拜拜 feels a bit more cute or casual. You can say it as you walk out of a shop. You can say it before hanging up the phone. It is the ultimate 'low-effort' social lubricant. Just wave your hand and let it out.

Use it with your friends after grabbing bubble tea. Use it with the taxi driver when you reach your destination. It is perfect for texting too. In WeChat, people often just type '88'. Why? Because the number eight in Chinese is 'bā'. So '88' sounds like 'bā bā', which mimics 拜拜. It is the ultimate shortcut for the lazy texter.

Avoid using it in extremely formal settings. If you are meeting a CEO or a high-ranking government official, stick to 再见 (zàijiàn). 拜拜 can feel a bit too 'cute' or 'lightweight' for a funeral or a serious legal meeting. If you are breaking up with someone and want to sound final and dramatic, this is too cheerful. It implies you'll see them soon.

This phrase entered Chinese through Hong Kong and Taiwan. It shows how much English has influenced modern urban Chinese culture. In the past, 再见 was the only standard. Now, 拜拜 has taken over the streets. It represents a shift toward a more relaxed, globalized social style. It is the sound of a fast-paced, modern city life.

You will often hear people add a 'lo' at the end: 拜拜啰 (bàibai lo). This makes it sound even more casual and sing-songy. Some people might say 掰掰 which is just a different way to write the same sound. And of course, the digital version '88' is king on the internet. It is the universal sign that the conversation is over.