What constitutes FLUFF???

So I just got my assignment for the 1 fic fest I am participating in for the year. But I have a general question. My person specifically says that one of the squicks/dislikes is fluff. Umm...what does that mean?

I think that almost everything I have written was pretty fluffy with the exception of the Bill/Neville/Charlie incest thingy and the Harry/Ron BDSM thingy. How do I do 'happy ending' without doing fluff?

Is my definition of fluff too broad? Maybe the cotton candy/cavity inducing type fluff is what they mean, but I am including all's well that ends well?

Discuss...