"Wula" is a transliteration word, and there is no unified explanation for its meaning. It depends on the situation at that time. For example, in the movie Ordinary Soldier, we translated "Ula" into "Chong" according to the plot of the movie. Sometimes it is translated as "Long live". However, we use transliteration more, so just give it a "ula". As for what it means, let the audience understand for themselves.