A small movement or series of movements, especially of the hands and feet, caused by nervousness or impatience. Her constant fidget during the meeting was distracting to everyone.
A person who is restless or unable to stay still. He's such a fidget; he can't sit through a movie without moving around.
A state or feeling of restless uneasiness (usually in plural form 'the fidgets'). I always get the fidgets when I have to wait for bad news.