a male or female who submits to the sexual whims of his or her partner, is available at any time for sex, yet never strays or has sex with anyone outside the owner/slut relationship

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.