Ahoy - A pirate greeting, or a shout to attract an attention. Something like "Hello!" or "Yo!".
Arrr, Arrgh, Yarr, Gar - A common pirate terms, which are used in different situations.
Avast - An order to stop and pay attention.
Aye - "Yes"
Aye aye - Conformation, taking order from the captain.
Belay - Usually means to tie something down but pirates used it to prevent someone to do something.
Booty – The treasures and other values plundered from the victim ships.
Bucko - A friend.
Davy Jones's Locker - A graveyard for people killed or drowned at the sea.
Dead men tell no tales - Means that a dead man cannot reveal any secret or fact. It was the reason why the pirates didn't like to spare any survivors.
I'll Crush Ye Barnacles - A common pirate's treat.
Jolly Roger - The well-known pirate flags, usually represented with symbols of a skull and the crossbones. The most recognized symbol of the pirates.
Lad - A younger person.
Letters of Marquee - A document issued by a government, which allowed the privateers and the buccaneers to legally attack the ships and the colonies of an enemy nation.
Maroon - To leave prisoners on island or desert coast.
Matey - A companion, a close friend.
Prize - A ship captured by pirates.
Savvy - "Do you understand?"
Sea Rover - A pirate, a pirate ship.
Shiver me timbers - idiom for surprise, shock. Usually used when a ship is hit in combat.
Smartly - To do something quickly.
Sweet trade - Another term for the trade of piracy.
Walk the plank - When someone is forced to walk on a plank, with hands tied behind. Plank is extended over the side of a ship, and victim is usually forced to jump to water and drown. Shown today as main pirates' amusement, although only a few real pirates practiced that.
Weigh anchor - "let's go", "get ready to sail on".
Yo-ho-ho - Salutation, expression of delight.