"atlkid" in this context appears to represent a scene or video involving an individual referred to as the "ATL Kid." This could mean that the performer is from Atlanta, or it might be a nickname given to the actor. The term itself doesn't provide any specific content details about the scene; however, as a porn content editor, I can infer that this tag is used to categorize videos featuring this particular actor or performer from Atlanta.
As an example, let's say the ATL Kid is a well-known and popular male performer in the adult industry. A video tagged with "atlkid" would indicate that this individual appears in the content and could be used to search for scenes or videos featuring him.