Jetsam
Jetsam , noun
[French jeter to throw: compare Old French getaison a throwing. Compare Flotsam, Jettison.]
1.
(Mar. Law) Goods which sink when cast into the sea, and remain under water; -- distinguished from flotsam, goods which float, and ligan (or lagan), goods which are sunk attached to a buoy.
2.
The act of throwing objects from a ship to lighten the load; jettison{1}. See Jettison, 1.
3.
Anything thrown overboard from a ship, whether floating or not.
4.
Objects scattered about in a disorderly manner; as, he couldn't find his sneakers among the jetsam in his room. [figurative; Colloquial]
Also: Jetson