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1.
A fat fuck who claims to be from the shitty state of south carolina but is in fact from virginia. Usually found with a dumb ass look on its face and its hand either scratching its fat ass or its little dick. Whenever this thing fucks up, it thinks a simple "ma bad" will do. Also is not able to get any pussy of anykind even kpa.
Guy: Who is that fat ass scratching his balls over there?

Girl: Thats an Ordinary Seaman , he sure wont shut up about south carolina and he makes my pussy dry.
by thisishowwedoit April 21, 2009
 
2.
Entry level deck department position aboard a Merchant Ship of the United States. After 365 days seatime, an O.S. can test for advancement to Able Bodied Seaman.

The Ordinary Seaman usually chips paint and rust, paints, splices and repairs lines, and assists (somewhat) in cargo operations and especially mooring/unmooring of the vessel.
The Captain of the ship started as an Ordinary Seaman on deck, and worked his way up the hawsepipe.
by DeepSeaSailorGuy May 14, 2007