Aargh, please help me!

Hi. I have a problem. Basically I heard a song in a shop that I LOVED and I want to get it, but I don't know what it's called or who it's by!
The song opens with female singers going 'NAAAA, NAAAA, NA NAAAA / NA NAAAA NA NAAAA
Then a female singer starts to sing. The main catchy parts of the song are when she sings things such as 'HE'S A MEAN MAN / MY MAN' , 'HE'S A MEAN MEAN GUY' and 'HE'S A MEAN MEAN ONE / SON OF A G*N'
Please please help me with this one! I expected the song to be called something such as 'mean man' but I'm getting no results
I really want this song! Sorry I have no more info on it

Its Stefanie Hienzmann, She is german or swiss

http://www.youtube.com/watch?v=ezHVWXPeGBA

Enjoy it