A chauvinist is someone who blindly and enthusiastically believes in the superiority of his cause or people . If you grew up in New York and refuse to eat at any pizzeria beyond a five-mile radius of the Empire State Building, you could be described as a New York pizza chauvinist. a person who has an aggressive and unreasonable belief that their own country is better than all others. Definition of chauvinist noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. CHAUVINIST meaning : believing that your country, sex, etc., is better than any other showing or filled with chauvinism CHAUVINIST definition: 1. believing or showing an unreasonable belief that your own country or race is the best or most…. Learn more.