Captain Rhyme

Okay, so basically, a "rapper" is like, a singer who raps, right? And a pirate is like, a sailor who steals stuff on the sea. So, if you mix them, you get a rapping pirate, and since "rhyme" sounds like "rime" which has to do with boats, the joke name becomes Captain Rhyme. It's a pun! You probably don't understand this joke, just like you don't understand why people avoid talking to you at parties.