天啦 is a Chinese interjection that is used to express surprise or amazement. In English, it can be translated as "Wow!" or "Oh my goodness!". It is not a common phrase in English, so it may not be understood by many English speakers.

Here are some examples of how to use "天啦" in Chinese:

天啦！他竟然赢了！ (Wow! He actually won!)

天啦！这个手机多贵啊！ (Oh my goodness! This phone is so expensive!)

The origin of the word "天啦" is not clear, but it is likely derived from the Chinese word for "heaven" (天), combined with the particle 啦, which is commonly used in Chinese to add emphasis or emotion to a phrase.