The term "shemale-tops-guy" is a description used in adult content, specifically within the transgender or TS (Transsexual) category of porn videos. In this context, "shemale" refers to a person who was assigned male at birth but identifies as a woman and may have undergone hormonal treatment or surgeries to feminize their appearance.
The tag "shemale-tops-guy" implies that the content of the video involves a shemale (TS) individual engaging in sexual activities with a male partner, where the shemale is taking the top or dominant role. This can include penetrative sex, oral sex, or any other acts where the TS performer is the one actively pursuing pleasure for themselves and their male partner.
In summary, "shemale-tops-guy" describes a porn video in which a transgender woman (also known as shemale) takes the top role during sexual activities with a male partner.