Definition - What does Catcher mean?
A catcher is a receiver of anal or oral penetration. A catcher can be male or female.
Kinkly explains Catcher
Generally, the term is used to describe the receiver of anal penetration, particularly in a homosexual couple. The penetrating partner is typically referred to as the top, or pitcher. The receiving partner is referred to as the bottom, or catcher. It is occasionally used to describe the individual who gives oral sex to a male partner as a catcher of semen.