What language do you call hi wuu2?

It appears you are asking about a Mandarin Chinese phrase "你好" (nǐ hǎo).

"你好" (nǐ hǎo) is the most common way to say "hello" or "hi" in Mandarin Chinese.

It is pronounced "nee how" in pinyin.

Let me know if you have any other questions about the Chinese language.