How do you say arrr?

Excuse me, but could you please clarify something for me? I'm curious about the phrase "How do you say arrr?" It seems to be a bit unconventional, and I'm wondering if it's meant to be a playful or humorous way of asking someone how they pronounce a certain word. Is it a reference to something specific, like a pirate's catchphrase or a pop culture reference? I'd appreciate any insight you could provide. Thank you!