"2D Animated Cartoon" refers to a type of adult animated content where the characters and setting are created using two-dimensional (2D) animation techniques. This means that objects, characters, and backgrounds are drawn individually on separate layers, then combined together in a series of frames which create the illusion of movement when played in rapid succession. These types of videos typically feature adult themes, such as explicit sexual content or adult humor, presented in a stylized animated format. The tag specifies that the content is a 2D animation rather than more complex 3D animations to give an idea of the visual style and technique used in the video.