"Turd" is more colloquial or casual word for "excrement" or "feces". Although this word is offensive, it is not as offensive as another word that I cannot write here. It's typically used as an insult but you can say it jokingly if you have a close enough relationship with a person and he knows that you are not being serious.

As a joke you can say it. But this expression is used only with friends of the same age group. And now the best part: 😁 Ready!!! It means” a lump of Poop 💩.”

Hello, It is not commonly used these days. It is offensive, but can be used jokingly among friends. I hope this answers your question. If you’d like to practice speaking. I’d be happy to help you develop a study plan. Feel free to view my teaching profile and class offerings and book lessons with me if you think I can help you. Regards.

"You fool". Yes. Anything can be said jokingly. But not necessarily received as such ;).