ferndiggle Share definition Flag In a rotating door, a ferndiggle is used to describe one of the compartments of the door. I'm going to walk through that rotating door to get into the building. I'll just get in a ferndiggle and push until I'm inside. ferndiggle by Danny Peck January 21, 2004 0 0 Get merch Get the ferndiggle mug. Buy Now — $32.95 See more merch