What's this song???

I work at F21 and i can't figure this song out.
It's on the March 09 playlist, and seeing how the dj doesn't have that one on the website, it's no help.
It's sung by a woman and the lyrics are something like "Yeah he's my man..." and then "You wouldn't understand" or "You can't understand"
and in the background there's piano, kind of like those little kids' pianos.

Sorry if that was a bad description ^..

Try Stefanie Heinzmann "My mean man"

http://www.youtube.com/watch?v=wWgrmiAl0jw

Goldfrapp - Satin Chic