大白 (dà bái) means "big white" in Chinese and can refer to a large white dog or other white animal. It can also be used to describe someone or something as pure or innocent.

In English, you could translate 大白 as "big white" or "whitey" when referring to an animal, or as "innocent" or "naive" when describing a person. Here are some example sentences:

I saw a big white dog at the park today.

She has a naive, innocent demeanor.

He was a whitey, with fur as soft as cotton.

I'm not sure of the exact origins of the term 大白, but it may have come from the Chinese description of a large white dog or other animal.