Yup, lyrics are bavarian. Our singer (as the rest of us) is from Bavaria, so it comes natural to sing in our mother tongue. I think it is much more authentic to do songs in your own language, although we used to do only cover songs of US/GB 70s Rock and Blues.
Actually, don't take what I said seriously. I was just kidding around.
It's cool to sing in Bavarian for this kind of music - kinda original!
But I still don't understand the lyrics...