Pirate Terminology:

Bilge rat - (1) A rat living in the bilge of a ship. It is considered the lowliest creature by pirates, but many pirates take to eating the animals to survive. (2) An insulting name given by a pirate.
Booty - Treasure
Chantey (also chanty, shantey or shanty) - A song sung by sailors to the rhythm of their movements while working.
Davy Jones' Locker - A fictional place at the bottom of the ocean. In short, a term meaning death. Davy Jones was said to sink every ship he ever over took, and thus, the watery grave that awaited all who were sunk by him was given his name. To die at sea is to go to Davy Jones' Locker.
Dead men tell no tales - Standard pirate excuse for leaving no survivors
Grog (see also spirits) - An alcoholic liquor, especially rum diluted with water
Jolly Roger - A pirate flag depicting a skull-and-crossbones. It was an invitation to surrender, with the implication that those who surrendered would be treated well. A red flag indicated "no quarter."
Keelhaul - To punish someone by dragging them under a ship, across the keel, until near-death or death.
Loaded to the gunwalls - To be drunk
Long boat - the largest boat carried by a ship which is used to move large loads such as anchors, chains, or ropes. pirates use the boats to transport the bulk of heavier treasures
Loot - Stolen goods; money
Measured fer yer chains - To be outfitted for a gibbet cage
Pillage - To rob of goods by force, especially in time of war; plunder
Piracy - Robbery committed at sea
Pirate - One who robs at sea or plunders the land from the sea without commission from a sovereign nation
Plunder - To take booty; rob
Rum - An intoxicating beverage, specifically an alcoholic liquor distilled from fermented molasses or sugar cane
Schooner - A fore-and-aft rigged sailing vessel having at least two masts, with a foremast that is usually smaller than the other masts
Sea Legs - The ability to adjust one's balance to the motion of a ship, especially in rough seas. After walking on a ship for long periods of time, sailors became accustomed to the rocking of the ship in the water. Early in a voyage a sailor was said to be lacking his "sea legs" when the ship motion was still foreign to him. After a cruise, a sailor would often have trouble regaining his "land legs" and would swagger on land
Splice the main brace - To have a drink or perhaps several drinks
Take a caulk - To take a nap. On deck of a ship, between planks, was a thick caulk of black tar and rope to keep water from between decks. This term came about either because sailors who slept on deck ended up with black lines across their backs or simply because sailors laying down on deck were as horizontal as the caulk of the deck itself
Walk the plank - the act of being forced off a ship by pirates as punishment or torture. The victim, usually blindfolded or with bound hands or both, is forced to walk along a plank laid over the ship's side and fall into the water below
Yo-ho-ho - An exclamation associated with pirates