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.