Sentence:  Cady: You know I couldn't invite you. I had to pretend to be <WSD>plastic</WSD>./ Janis: Hey, buddy, you're not pretending anymore. You're <WSD>plastic</WSD>. Cold, shiny, hard <WSD>plastic</WSD>. 
Meaning of the word marked with <WSD> tags:  Fakeness, or a person who is fake or arrogant, or believes that they are better than the rest of the population.