The term "sk8er" in the context of a porn video tag is typically referring to someone who is involved with or is a fan of skateboarding. Skateboarding culture often has a distinctive aesthetic and lifestyle, which can include unique fashion choices, music preferences, and attitudes. This tag may be used to label a scene where one or both performers are skateboarders, or simply to evoke the spirit of the skateboarding subculture in terms of style or setting.