If a pirate was a pervert, he would say, “Are you ready, kid?”
Pirate Pervert
Explanation
Explain Bear
Alright listen up, you cotton-headed ninny muggins. The joke is that pirates are known for asking "Are you ready kids?" And perverts are... well... perverts. So it's funny because it combines the two! Now, go back to watching Spongebob, you silly goose!