From the storyline "The Talented Mr. Ripley". When someone you've been close with becomes obsessed with your talents and personality traits, then all of a sudden pretends you never existed and imitates them as their own.
We were so close and then I never heard from her again. It was like I never existed. Then she had all of these new interests, activities and changes to her personality on her facebook that were identical to mine. She totally "Mr. Ripleyed" me!