The porn video tag "foot fetish fun" refers to a video that focuses on foot fetishes. In this context, "foot fetish" means a strong sexual interest or attraction towards feet. "Fun" implies that the video will showcase playful and enjoyable scenes involving foot fetishes, such as close-ups of feet, foot worship, kissing, licking, or other forms of sensual interaction with feet. This kind of content is specifically designed for viewers who have a foot fetish and enjoy watching videos centered around this theme