1. Term for an unprincipled person who lies and pretends to be a victim in order to gain public sympathy when threatened with exposure as the fraud he or she is. These tactics are similar to the 'Big Lie' used in nazi germany.
2. A person incapable of or unwilling to tell the truth. See turnspeak .
Man, that guy is such a Dershowitz! Why can't he just admit he is wrong? Instead he has to attack anyone who points out his lies. I feel sorrry for him.