Definition
"Niffy" is a British slang term for something that smells unpleasant. It's a casual and informal way to say something is a bit stinky. Imagine a slightly smelly sock, or a room that needs airing out. 👃 It's not as strong as "fetid" or "putrid," but it's definitely not a pleasant smell. Unlike a perfume, something "niffy" is something you'd want to avoid smelling.