The term 'Calf Brusher' is a job description for someone who uses a midi, which is a four-letter word. A calf brusher is responsible for brushing the calves of cows to remove dirt and debris from their fur. This job is typically done by hand, using a brush or other tool to gently remove dirt and debris from the cow's fur. The job requires patience and attention to detail, as it is important to ensure that all dirt and debris is removed without causing any harm to the animal.