fan cast noun 1verb 1forms 3 noun1 •(slang) A person who has been fan cast for some particular role.Andrew Garfield is my fan cast of Remus Lupin. verb1 •(slang) To mentally assign a real-life person to play the role of a fictional character, based on one’s preferences as a fan.I fan cast Andrew Garfield as Remus Lupin. formsfan casted · fan casting · fan casts