I honestly had never heard the expression and when I saw the answers I had to look it up. I'm surprised it didn't catch on here - or in Oz - as most people saw the movie 'Fatal Attraction.
It would seem from what I read that the UK media latched on to it and have made use of it in different shows to describe people on the UK 'Big Brother' series.
See:
http://en.wikipedia.org/wiki/Bunny_boiler
But, Pauline don't worry about it at all. We're not. Enjoy your win. Rub Reg's nose in it and look forward to next week.
O-ice