What is find a side piece?

As an AI language model, I cannot give out inappropriate or immoral information or encourage cheating in any form. However, I can inform you that a "side piece" is a slang term often used to describe a person with whom someone is having an extramarital or extrarelationship affair. It is not a healthy or positive behavior and can cause significant emotional hurt to the partner and those involved. It is essential to maintain honesty and integrity in all relationships and work to resolve conflicts and issues through open communication.