Programmer Art refers to temporary graphics added by the software developer to test functionality. When creating the artwork, speed is a priority and aesthetics are secondary (if they are given any consideration at all). In fact, programmer art might be intentionally bad. This draws attention to the fact that the artwork is only a placeholder and should not go into the final product. This practice might also speed its replacement.
Examples include stick figure

Stick figure

A stick figure is a very simple type of drawing made of lines and dots, often of the human form or other animals. In a stick figure, the head is represented by a circle, sometimes embellished with details such as eyes, mouth or crudely scratched-out hair. The arms, legs and torso are all...

 sprites

Sprite (computer graphics)

In computer graphics, a sprite is a two-dimensional image or animation that is integrated into a larger scene...

 and fuchsia

Fuchsia (color)

Fuchsia is a vivid reddish or pinkish purple color named after the flower of the fuchsia plant, itself named after the German scientist Leonhart Fuchs...

 textures

Texture mapping

Texture mapping is a method for adding detail, surface texture , or color to a computer-generated graphic or 3D model. Its application to 3D graphics was pioneered by Dr Edwin Catmull in his Ph.D. thesis of 1974.-Texture mapping:...

.
Programmer Art is also a slur

Pejorative

Pejoratives , including name slurs, are words or grammatical forms that connote negativity and express contempt or distaste. A term can be regarded as pejorative in some social groups but not in others, e.g., hacker is a term used for computer criminals as well as quick and clever computer experts...

referring to the art created by an independent or hobbyist developer, where a single person is responsible for all aspects of software/game development. As the creator in this case is typically a developer rather than an artist, the resulting art is functional rather than conformant to prevailing aesthetic norms.