What does "fuss" mean? Is it slang?

Native speaker’s answer
Rebecca
"Fuss" isn't slang! As a noun, it means an excessive excitement or interest in something. It can also mean a protest or complex procedure for something. As a verb, it means to show excessive concern. Ex: She's been fussing over the decorations for over an hour now. Ex: What's all the fuss with this party? Ex: Stop making a fuss of it. = Stop making it a big deal. Ex: It wasn't a fuss to find our way here.