10/14

i always took this phrase as referring to stuff washed ashore, basically any debris that comes out of the sea, both natural & man made... but here is the actual definition:

"Flotsam and jetsam are terms that describe two types of marine debris associated with vessels. Flotsam is defined as debris in the water that was not deliberately thrown overboard, often as a result from a shipwreck or accident. Jetsam describes debris that was deliberately thrown overboard by a crew of a ship in distress, most often to lighten the ship's load. The word flotsam derives from the French word floter, to float. Jetsam is a shortened word for jettison."