Pronounced also as “Yarrr!” and “Arg!”, the word “Arrr!” is traditionally said by pirates when responding "yes" or when expressing excitement. ... Many of the phrases that most people think of as pirate speech today can actually be traced back to portrayals of pirates in movies.

Did pirates actually say argh?

But while many pirates and mariners did hail from the West Country—so you might have heard an "arr" here or there—most did not, so the majority of pirates almost certainly didn't speak like Newton's Silver, Woodard added.

What does Argh Matey mean?

“Shiver Me Timbers” is an expression of surprise and fear. “Matey” is a friend or crewmate.