I have a friend who acts horribly mean to people but whenever he needs something from the person he has been mean to, it is like he becomes another person. He acts extremely nice.However, even if he does get the thing he wants he instantly goes back to being mean. I have been trying to find a word that describes this person but I can't seem to find it. Any ideas?
**1. Having two faces or surfaces. 2. Hypocritical or double-dealing; deceitful.