Mainly foxes, but used to describe any animal or object that is big and fluffy. Such examples include Pomeranians, Shiba Inus, Corgis, Maine Coons, Himalayans, male lions (mane), rabbits, chinchillas, afros, pillows, whipped cream, and others. It can also be used to substitute certain words in common phrases.
"That floof is so cute!" he said while staring at a red fox.
"How the floof did he manage to do that?!"
"What the floof?"
"Are you floofin' kidding me?!"
"Do you want to visit the fox village in Japan?" "Yes, I must hug every single floof there! ALL THE FLOOFS!"
Floof (derived from "fluff") is an adjective used to describe a ridiculously fluffy object or an animal (usually a long-haired cat or an equally hairy dog).
It can also be used as a verb to "floof" someone, but this only applies to the furry fandom in which one furry uses his/her fur (in the case of a long-haired furry, again a canine or feline) to overwhelm his/her friend with fluffy fur.
It can also be used as a cute non-malicious scolding or a cheering word.