The term 'TIP JAR FILLERS' refers to people who work in the service industry and are responsible for collecting tips from customers. These individuals typically work in restaurants, bars, cafes, and other establishments where customers can leave a tip. They may also be responsible for counting and organizing the tips at the end of the shift. The job title 'ONES' is an acronym for 'ONES Who Earn Nicely from Service, ' which is a fitting description for these individuals.