Having a fancy over a particular snack for a certain period of time; when your boredom of that previous snack takes over; you begin to choose another particular different snack for a certain period of time and so forth in a cycle...

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.