1648, from sub- + marine. The noun meaning "submarine boat" is from 1899. The short form sub is first recorded 1917. Submarine sandwich (1955) so called from the shape of the roll.
n. and sub; hoagy; torpedo; grinder; poor boy; hero. a long sandwich containing many different foods. (Sometimes many feet long. It is cut into smaller segments for serving a group. Usually contains sliced meats and cheese, as well as tomatoes and onions. Terms vary depending on where you are in the country.) : He ordered a submarine, but he couldn't finish it.
n. a large marijuana cigarette. : Look at the size of that sub!
n. [menstrual] tampon. : My God! I'm out of submarines!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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