basically someone who is just not true to themself and only does things to try to impress other people in an attempt to make friends , often will even do drugs if someone tells them its "cool"
when you deny how you're really feeling and put on a happy face.
Fake = Pretentious. False face. Poser.
Fake means you are pretending to be someone you are not to please others or that you act a certain way so others don't know what you are really like. Example: someone who goes around caring for others and then treats their own family horribly.
Someone who can't truly be themselves. It's like being an actress in front of everyone all the time. You are perceived one way, but are the complete opposite.
So.. you've never seen "Jerry Springer??"