Why is it when I am super super angry my bottom lips shakes as if I am shivering?

When you're extremely angry, your body undergoes a stress response, triggering the release of adrenaline and other hormones. This can lead to muscle tension and involuntary movements, such as shaking or trembling, particularly in areas like the lips. The shaking may also be a result of heightened emotional intensity, where your body's physical response mirrors your feelings, much like how some people may tremble when they're excited or scared.