Lyric discussion by pablostinger 

macumba is a religion, but it do has something related to black magic. it came from Africa and became popular in Brazil.

"bat" is a reference to batman. (no, really.)

the tropicalia is about mixing brasilian culture (e.g. the macumba) with american and european culture (e.g. the batman) and a lot of irony.

hard to explain, but you can see it all in the song.

ps.: it has nothing to do with a bat-like god.

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