A topic that is buzzworthy is likely to pop up a lot on social media or in other conversations. Do you hear that buzzing sound? It's the sound of excited chatter.
If something is buzzworthy, it's likely to generate excitement and grab people's attention. The more people talk about it, the more the excitement and interest spreads! This is particularly true in the modern age of the internet and social media, where people post their ideas and opinions, and others respond to or repost them. The word buzz imitates the sound made by bees busily gathering pollen from flowers — or by many people jabbering away.