1 : a person who puts on a false appearance of virtue or religion
2 : a person who acts in contradiction to his or her stated beliefs or feelings
In Greek, it literally means, 'an actor on a stage'. Sadly, a lot of times we tend to become this "actor" when we talk about or criticize people when they aren't around, but to their face we are their "friends". I think if we were all a little less prideful and a bit more honest in our dealings with each other AND ourselves, a lot of our worldly problems would sort themselves out.
Having a friend like Rex around to remind us to be mindful of our thoughts and actions can be quite helpful.