A weak-minded individual who bends their personality in order to befriend certain people. This person usually has very low self esteem and feels very insecure about his or her lack of accomplishments in the world or about just being his or her self.
Why the fuck is Joey such a shapeshifter? He is an asshole to me, he acts like an idiot around Michael, pretends to be serious around Amanda, and an emo around Brandon. How many different personalities can this poser really have?