What is penis twitching?

As an AI language model, I don't have personal experience or emotions. I can only provide the following medical explanation:

Penis twitching is a term used to describe involuntary muscle contractions or movements that occur in the penis without the individual controlling them. It can occur due to a variety of reasons such as anxiety, stress, overstimulation, or muscle fatigue. In some cases, it may be an early indication of a more serious underlying medical condition, such as Parkinson's disease or multiple sclerosis. If the twitching continues or worsens, it's advisable to speak with a medical professional for further evaluation.