General Definition: 1. The action of applying something to the surface of something, such as a liquid with a swab, or any thing or any action directly or indirectly associated with this, especially a filler. As a Noun: 1. In car mechanics and panel beating, a substance used for filling cracks or holes, especially in car bodies. English = filler. As a Verb or Adjective: 1. In car mechanics and panel beating, to fill a crack or hole in the body of a car with filler.