I've seen weapons with weird names like "furyfists" and "furyknife". I think that they're the unique weapons each character class wields when they activate their fury. How do you get them outside of fury?
In Dead Island, there are four character classes, much like Borderlands. And much like Borderlands, they each have a unique (action) skill A.K.A. fury. When fury is activated, the character wields a unique weapon that's common to each individual character's fury.