If you are to google the word 'baiana' you may come across some confusing and some totally unrelated definitions or websites.
But I think that the right one (or that relates to the card) is that the word 'baiana' actually means 'a woman from Bahia' where the old spelling used to be 'bahiana'. It is said that people from Bahia have a distinct culture and are very influenced by their african ancestry.
well, if we are to believe what google says :)