… or rather, Narrrr.
Arrrr is the term for “yes” spoke in a part of England whence that rascal Robert Newton hailed, so when he formed his dialect model for his stint as Long John Silver in Disney’s Treasure Island, he threw that in. His other piratitisms he fetched from like personal background. The truth of it is that that Long John himself hails from the same digs (West Country), but most pirates did not.
Ker Than at National Geographic News has the skivy on the pirate lingo avast. Might I suggest you sail yer ship on over there for a maw full of learnin’
I made up the thing about “Narrrrr” by the way. But it COULD mean no in some language, I suppose.