The term 'Happy Motoring Sloganeer' refers to the Esso advertising campaign of the 1950s and 1960s. The campaign was created by the Esso oil company, which is represented by the four-letter acronym ESSO. The slogan was used to promote the company's products and services, and it was a popular phrase during the era. The slogan was used in various forms of media, including television commercials, radio ads, and print advertisements. The phrase was also used in other contexts, such as on bumper stickers and signs. The slogan was a reminder to motorists to enjoy their time on the road and to be safe while driving.