sea-going bellhop means: A derogatory term for a United States Marine. A common reference to MARDET, the Marine Detatchment present on certain Navy ships. MARDET personnel are sentries, security, orlies and also provide honor guards for special occasions. They provide the core of the ship’s landing party. This epithet is good for starting a fight against any Marine, not only MARDET. If said with lots of humor. Your own trauma surgeon. (in Community Dictionary, added by Christine Woodard)