a person that has the lowest rank in the restaurant business. They usually scrape food off dishes, then rinse them then shove them through a dishwashing machine. Being a dishwasher sometimes means you work hard (but don't get appreciated.) It's a job you take until you find something better.
Chef: "Hey, dishwasher, where the fuck are the clean knives?"
Dishwasher: "I only have two arms and two legs!"