Banoffee?

I don't like Tully's, but almost every day on my way to a much tastier coffeeshop I have to walk by one and I see the poster in the window flaunting the shop's latest creation...

And every day, when I think of the combination of bananas and a latte, I get a little dizzy and sick to my stomach. I also wonder "What the fuck kind of word is Banoffee?"