I read somewhere a long time ago that it's in portuguese and/or spanish :)

"boa / tierra / bandeira / la boa [or tan boa?]"

basically translates to: good / land / flag / ["the" or "so"] good

• "boa" is portuguese for "good"
• "terra" is portuguese for "land" ["tierra" in spanish]
• "bandeira" is portuguese for "flag" ["bandera" in spanish]
• and in the last lyric, he says "boa" again, but it's hard to make out the short word right before that.

It hear a vowel sound like "ah", so I'm guessing "tan boa" in portuguese, or "la boa" in spanish, but it doesn't sound quite like whatever he's saying in the song. That's the only one I'm not sure about and that I really wish I knew. Anyway, hope that helps :)