talking like a pirate

Ahoy - Hey!
Arrr - Yes, I agree, I'm happy
Avast - Stop!
Aye - Yes Bilge
Rat - an insult.
Black spot - to be 'placin' the black spot' be markin' someone for death. As in Treasure Island.
Booty - treasure
Bung hole - Food on a ship were stored in wooden casks. The stopper in the barrel is called the bung, and the hole is called the bung hole.
Buccanneer - a pirate who be answerin' to no man or blasted government.
By the Powers! - an exclamation, uttered by Long John Silver in Treasure Island!
Cat o' nine tails - whip for floggin' mutineers
Corsair - a pirate who be makin' his berth in the Med-...Medi-...that sea 'tween Spain and Africa, aye!
Davy Jones' Locker - the bottom o' the sea, where the souls of dead men lie
Doubloons - pieces of gold...
Fiddlers Green - the private heaven where pirates be goin' when they die.
Furner - a ship which be yer own, not one ye steal an' plunder. 
Gentlemen o' fortune - a slightly more positive term fer pirates!
Go on the account - to embark on a piratical cruise.
Grog - A pirate's favorite drink.
Hornpipe - Both a single-reeded musical instrument sailors often had aboard ship, and a spirited dance that sailors do.
Jack - a flag or a sailor
Jolly Roger - the skull and crossbones, the pirate flag!
Keelhaul - a truly vicious punishment where a scurvy dog be tied to a rope and dragged along the barnacle-encrusted bottom of a ship. They not be survivin' this.
Landlubber - "Land-lover," someone not used to life onboard a ship.
Lass - A woman.
Lily-livered - faint o' heart
Loaded to the Gunwales (pron. gunnels) - drunk
Matey - A shipmate or a friend.
Me Beauty - A lovely lady.
Me hearty - a friend or shipmate.
Me - My.
Pieces o' eight - pieces o' silver which can be cut into eights to be givin' small change.
Privateer - a pirate officially sanctioned by a national power
Scallywag - A bad person. A scoundrel.
Scurvy dog! - another fine insult!
Shiver me timbers! - an exclamation of surprise, to be shouted most loud.
Smartly - do something quickly.
Son of a Biscuit Eater - a derogatory term indicating a son of a sailor.
Sprogs - raw, untrained recruits.
Squadron - a group of ten or less warships.
Squiffy - a buffoon.
Swaggy - a scurvy cur's ship what ye be intendin' to loot!
Swashbucklin - fightin' and carousin' on the high seas!
Sweet trade - the career of piracy.
Thar - The opposite of "here."
Walk the plank - this one be obvious.
Wench - a lady, although ye gents not be wantin' to use this around a lady who be stronger than ye.
Wi' a wannion - wi' a curse, or wi' a vengeance. Boldly, loudly!
Yo-ho-ho - Pirate laughter