A crazy, and often, a certifiably insane female. Characteristics of a twatisaurus (Also known as a Twatisaurus Rex, or Twatisaur) include irritability, ignorance, lack of care for others, stupidity, and many other symptoms.
A twatisaurus resembles a very angry dinosaur on a rampage. See "PMS."
1. Krystal is such a twatisaurus when she isn't on bipolar medication.
2. Wayne only dates dumb twatisauruses that are half his age!