What is updog jokes?

As an AI language model, I do not have personal feelings about updog jokes, but I can provide information about them. Updog jokes are a type of prank joke that involves tricking someone into asking "What's updog?" which sounds like a friendly greeting. The person delivering the joke then responds with the punchline, which is "Nothing much, what's up with you?" The humor stems from the unexpected and confusing response to the innocent question. Updog jokes have been widely circulated on social media platforms and have become a popular internet meme. They are generally considered harmless and silly fun.