Very good.
It's what my team in Brasil, Fluminense's fans sing to Flamengo. As Flu are generally a white and more middle class team it's a reference to Flamengo getting a lot of support from the slums (favelas) although Flamengo have fans in every strata of Brazilian society.
As I discovered on a recent business trip to São Paulo fans of Corinthians sing the same thing to them.