Definition
To be 'jerking' means to move or twitch abruptly and uncontrollably. It suggests a sudden, uncoordinated motion, often repetitive. Think of it as the opposite of a smooth, graceful movement. It's like a puppet whose strings are being pulled too quickly. A minor instance can be nerves; a major one could be a medical condition. Sometimes, it can even be used to describe humor that is awkward and unfunny.