1) Term of endearment associated with those you love to hate.
2) noun
Used in context within a heirarchical notion - a twat at the peak of his twatting career.
3) noun - disease
Able to be spread by physical contact (eg. rubbing up against someone accidentally) but not by sexual intercourse - thus allowing intercourse to take place naturally without hinderance or need for protection.
1)Derk: Why does he have to be such a twat all of the time dood...?
Jo: what you have to remember is that his royal twatness cannot stop himself from shaving his scrotum with his teeth...