darkfinn Share definition Flag Multiple personality disorder in which one believes that they are a totally rad and awesome fish based superhero, always fighting their arch nemesis... the evil Skeletor! Wow, DarkFinns muscles are so big and hot, I would love to date him! darkfinn by DarkFinn September 23, 2017 0 0 Get merch Get the darkfinn mug. Buy Now — $32.95 See more merch