Argentinian acronym which means "la concha de tu hermana", which is something like "your sister's pussy". Useful when manifesting displeasure or disapproval to someone, specially when dealing with stubborn people.

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.