When a man puts his testicles on a females forehead and quickly does a reverse pelvic thrust so that the testicles slide down her face similar to rocks sliding down a hill.

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.

When you are in a girl and you pass a kidney stone through your penis into her vagina or anus cavity. Thus a rock slide.