A main-stream-media commercial or review that's broadcasted by a competitor or a disgruntled customer-group, and which criticizes or otherwise negatively portrays a certain product, service, philosophy, etc.
Henry Ford didn't mind having people launch acridly-critical adversetisements about him, he viewed those rants as just another way of spreading the word about his company and its merchandise --- "I don't care what you say about me --- just keep talking!"
by QuacksO June 24, 2018