Let me check if "Jolly Jack" refers to a toy called "Jack-in-the-box," but no, that's a different concept. Alternatively, "Jack-in-the-pulpit," which is a plant. Doesn't fit either.
Another possibility is that "Jolly Jack" is an internet meme or a character from a specific community. For example, in some online communities, users create characters with names like that. If the user is referring to a specific meme or forum, I might not have that information in my training data if it's recent. jollyjack thread
If it's a toy, maybe it's similar to a "Jack-in-the-box," but with a jolly character. Then the thread part could be part of the mechanics, like a string that unwinds. But I'm not sure. Alternatively, maybe it's a type of yo-yo or a spinning top that uses a string. Let me check if "Jolly Jack" refers to
Alternatively, looking at the word "thread" in a technical sense, maybe in a forum, a thread is a discussion topic. If there's a user named "Jolly Jack" who started a thread, that could be the context. However, without specific info on such a thread, it's hard to provide details. Another possibility is that "Jolly Jack" is an