an extremely boastful, self-righteous person. One who comes off as a friendly person until he gets into a position of power, whereupon the abuse of such power follows. He declares his actions as always being the right ones; never admits wrongdoing, even when evidence suggests the latter. When he is punished for his actions, the "blame-game" will ultimately be implemented, whereupon he will become extremely defensive of himself and disrespectful to others.
(1) a backstabber, a bully, an imposter (such as a friend who is really a foe), Internet tyrants, etc.
(2) a very mild form of megalomania