Jambo (Swahili greeting),
Retarded = relatively slow in mental or emotional or physical development (synonyms: unintelligent, stupid). A perfect fit for this joke I would say.
Here is another bonus retarded joke:
Joke teller: Do you want to hear a dirty joke? (Maybe you do. Maybe you don’t. It doesn’t matter. There is no way to halt the telling of this joke.) X number of white horses fell in the mud.
To joke teller: Did they? Well, that’s not a dirty joke. That’s dirty horses. Let me know when you can tell the difference and I’ll consider speaking to you again.
That’s all I’ve got for now. I hope you enjoyed my Retarded Jokes series. Its done. Coming soon, a new series that I call Safety Nut Thrill Seekers.