A twat that twitches, unprovoked, at random times throughout the day. Twitches can vary in duration, and intensity, and can be a source of extreme pleasure/discomfort to the owner of said twat.
Girl #1: Omigod, I cannot wait for class to be over.
Girl #2: Why? What's wrong.
Girl #1: Twitchy twat--I've had it all day.
Girl #2: Why? What's wrong.
Girl #1: Twitchy twat--I've had it all day.
by Jr Space Cadet April 11, 2009