A fan who is so devoted and in awe of a celebrity, that even if that celebrity starts on the downhill slope of anorexia or bulimia, the fan will follow them. They will adopt bad eating habits and/or drug addictions just to be as skinny as that celebrity which they idolise so.

A pick me is a woman that is willing to do anything for male approval. She will embarrass or throw other women under the bus to achieve this goal. The unfortunate thing about a pick me is usually the men they are trying to seek approval from are of poor quality and treat women badly, leaving little real benefit for the pick me.

Fake anorexic / fan of anorexia. Aka someone who tries to act like they have a real problem to get attention and pity.
Can be used as both an adjective and a noun.