A girl who looks like/gets mistaken for a lesbian, but really isn't, and tends to get all other lesbian's "excited"
The girl is only a tease to lesbians. This confusion is often due to the girl's appearance, i.e. low pony tails, baggy clothes, tough attitudes, etc.,

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.