When you have an orgasm so good you still shake and tremble hours after it, similar to someone who has Parkinson's disease. Your hands shiver, your body trembles for a long time, where people would think that you have that disease.
My boyfriend gave me Parkinsons the other day and I was walking like I was electrocuted or something. Many people thought that I had Parkinsons but I told them it was just the aftershock of a good orgasm.
I got the best sex the other day and I couldn't walk afterwards, it was like I had Parkinson's because my body couldn't stop shaking for hours.