The term 'CAST BIGWIG' is a combination of two words that refer to a person in the entertainment industry. The first word, 'CAST, ' refers to the process of selecting actors for a movie or television show. The second word, 'BIGWIG, ' refers to someone who is important or influential in the industry. Therefore, the term 'CAST BIGWIG' refers to someone who is important or influential in the casting process of a movie or television show. This person is typically responsible for selecting the actors and actresses who will be featured in the production.