The adjective "hoppy" is used to describe something that has a characteristic of being lively, energetic or full of enthusiasm. It can also refer to something that is bouncy and light in texture, similar to how one might imagine a rabbit or a kangaroo moving around with agility and speed. The term "hoppy" could be used to describe someone's behavior as well - for example: "He has such a hoppy personality; always full of energy and optimism."