What does Metamorfose Ambulante by Raul Seixas means to Brazilians?

Hi guys, German guy here 👋🏼 I have a question that is bothering me for a long long time now. First of all I'm a huge Fan of the movie 'City of God' it's one of my top 3 movies of all time. And in this movie I discovered my favorite song of all time which is 'Metamorfose Ambulante by Raul Seixas. And for all those years, I'm questioning myself what this song is about and what it means to the Brazilians. Hope you guys can help me with this. Greetings from Germany 👍🏼