Reddit mentions of The Pirate Primer: Mastering the Language of Swashbucklers and Rogues

Thanks! I have a swashbuckling rogue character for Pathfinder, and I go to Renaissance faires as a pirate. I got a copy of this for Christmas a couple of years ago, and use it for ITLaPD and tabletop quite a bit. It's an awesome read and consult for piratey jabberin'

Even for pirates, thar be rules of grammar.

There is an implied go in there. Must is a modal verb that expresses the necessity of the implied go. And away is an adverb.

It is similar to the phrases let's away or let's to [a place] (though that one uses a prepositional phrase instead of the adverb away), which pop up all the time in Shakespeare's plays and the plays of his contemporaries.

And apparently these phrases are also vital components of the pirate vernacular, as evidenced by The Pirate Primer: Mastering the Language of Swashbucklers and Rogues.