A gaff-rigged fore-and-aft sail set from and aft of the aftmost mast of a square-rigged ship; a spanker.
A fly ball that is weakly hit just over the infielders.
The Vietnam-era M79 grenade launcher (due to its distinctive report).
A filmed or videotaped outtake that has recorded an amusing accident and/or mistake.
A blunder, an error.
A strong vertical post of timber or iron, fixed to the ground and/or on the deck of a ship, to which the ship's mooring lines etc are secured.
A similar post preventing vehicle access to a pedestrian area, to delineate traffic lanes, or used for security purposes.