The punchline in the joke I found on the internet was written like this when the guy gets in the cab:

"Jossa Driva" and I think it signified a blaccent. Could that be right? I mean what is jossa driva? I took it to mean that he was black and black men do anal? I don't know. At any rate, I couldn't have him speak in a blaccent so I just wrote just drive. I could have totally misunderstood the joke, though. I know.