Spanker /(spăṉk"ẽr)/

Spank·er

Spanker

n.
  1. One who spanks, or anything used as an instrument for spanking.
  2. The after sail of a ship or bark, being a fore-and-aft sail attached to a boom and gaff; -- sometimes called driver. See Illust. under Sail. (Naut.)
  3. One who takes long, quick strides in walking; also, a fast horse. [Colloq.]
  4. Something very large, or larger than common; a whopper, as a stout or tall person. [Colloq.]

Phrases & Compounds
Spanker boom
a boom to which a spanker sail is attached. See Illust. of Ship.

Spanker

n.
  1. A small coin. [Obs. or Prov. Eng.]