McFish Fillet Share definition Flag A clever and effective nickname for a girl with a smelly vag, McFish being the first name Fillet being the last. Hannah: wow, hunter do you smell that Hunter: Yea, it's ol' McFish Fillet behind us McFish Fillet by Hunter "The Immaculate" December 9, 2003 Get the McFish Fillet mug.