Here's a list of usefull Pirate Phrases I found:
Aaaarrrrgggghhhh! - exhortation of discontent or disgust
Ahoy! - Hello!
Ahoy, Matey - Hello, my friend!
Ahoy, me Hearties! - the same as saying "Hello, my friends!"
All hand hoay! - comparable to all hands on deck
Avast ye - stop and check this out or pay attention
Aye - yes
Batten down the hatches - put everything away on the ship and tie everything down because a storm is brewing
Bilge-sucking - insult
Blimey! - exhortation of surprise
Blow me down! - expression of shock of disbelief akin to "Holy Crap!"
Blow the man down - command to kill someone
Booty - treasure
Buccaneer - a pirate
Bucko - a buccaneer
Cat O'Nine Tails - a whip with nine strands
Corsair - pirates in the Mediterranean Sea
Crow's nest - small platform atop the mast where the lookout stands
Cutlass - short heavy curved bladed sword used by pirates
Davy Jones' Locker - fabled, mythical place at the bottom of the ocean where the evil spirit of Davy Jones brings sailor and pirates to die
Dead men tell no tales - phrase indicating to leave no survivors
Doubloons - other coins or found in pirate hoards and stashes
Feed the fish - will soon die
Hang 'im from the yardarm - punishment of those captured in battle
Head - the pirate ship's toilet
Heave Ho - give it some muscle and push it
Hempen Halter - a noose for hanging
Hornswaggle - to defraud or cheat out of money or belongings
Jacob's Ladder - the rope ladder one uses to climb aboard a sloop
Jolly Roger - pirate's flag including white skull and crossbones over a black field
Keelhaul - punishment in which a person where dragged underneath the pirate ship from side to side and was lacerated by the barnacles on the vessel
Lad, lass, lassie - a younger person
Landlubber - big, slow clumsy person who doesn't know how to sail
Letters of Marque - letters issue from governments during wartime to privateers endorsing the piracy of another vessel
Man-O-War - pirate's ship outfitted for battle
Me - my
Mizzen - third mast from the bow of the ship on ships that have three or more masts
Old Salt - an experienced sailor
Pieces of eight - coins or found in pirate stashes
Pillage - rob, sack or plunder
Poop deck - the part of the ship farthest to the back, which is usually above the captain's quarters. This is not the bathroom.
Privateer - government-sponsored pirates
Rum - pirate's traditional alcoholic beverage
Run a shot across the bow - warning shot to another vessel's captain
Savvy? - do you understand and do you agree?
Scallywag - mild insult akin to rapscallion or rogue
Scurvy dog - the pirate is talking directly to you with mild insult
Scuttle - to sink a ship
Seadog - old pirate or sailor
Shark bait - will soon join Davy Jones' Locker
Shipshape - cleaned up and under control
Shiver me timbers! - comparable to "Holy Crap!"
Son of a Biscuit Eater - insult directed towards someone you don't like
Thar she blows! - Whale sighting
Three sheets to the wind - someone who is very drunk. One sheet is mildly drunk and four sheets is passed out.
Walk the plank - punishment in which person walks off a board jutting over the side of the ship while at sea. The consequence is drowning and a visit to Davy Jones' Locker.
Weigh anchor and hoist the mizzen! - pull up the anchor and the sail and let's get going
Ye - you
Yo Ho Ho - cheerful exhortation to demand attention
