A Fluffy that’s just an asshole.
Coined to describe how more and more Fluffies were all presented as nasty little fuckers nobody could love, used often now to describe ones that are just evil or a jerk for whatever reason.
Became synonymous with Smarty, but some people write them in such a way that a Smarty is simply the leader of a Hellgremlin herd, others distinguish Hellgremlin Smarties from Smarty-friends.