1, Wu Zixu is just a modal particle at the end of the sentence, just like we usually use "ah" and "ya". It originated from the habit of a fan in European and American music circles, and later spread to the Internet, becoming a hot word on the Internet. When combined with different words, it will have different tastes and make the tone more vivid and lovely.

2, speechless, online buzzwords, speechless. Similar word formation includes good girl, sperm and fool.