The porn video tag "3d toon vids" refers to a specific type of adult content. It represents animated, three-dimensional (3D) cartoon videos that include explicit sexual scenes and themes. These types of videos combine 3D animation techniques with adult content, creating a unique experience for viewers who enjoy both animation and adult entertainment. The characters in these videos are usually stylized and may resemble popular comic book or video game characters, adding an element of fantasy to the scenes depicted.