A lifeless low IQ individual that spends their time being an obsessive fan of an athlete, musician, celebrity, product, brand, or sport's team. This is usually done because the individual is a failure and has nothing else going on their life so they live vicariously through a 3rd party celebrating the 3rd party's accomplishments as if they were their own. The individual abandons logic in favor of senselessly worshiping, supporting, and defending this 3rd party who couldn't care less about them. Unfortunately, the fan fuck fails to realize that behaving this way will only deteriorate their social standing further. A fan fuck generally has no independent accomplishments of their own which is seen as the gateway of becoming a fan fuck.

when you're hungover as shit after a spending a night drunk as a skunk

A fanbrat who passed the brat stage

A term for smut fanfiction written by some weaboo who likes to imagine his favorite anime girls getting gangraped.