Derp is an unknown, unpredictable, and often random, magical entity, force, and substance that has the power to create worlds and life. It's potrayed as an all-knowing, conscience individual and can be compared to that of Mother Nature in Earth. It is the main building block of the Aftonian population and seems to have a mind of it's own. This "mind" is divided into sections that are allocated to an Afton so that it can store memories and process actions. These division can be accessed at any time by Derp so that know secrets can be kept. It can be often unpredictable in creating new worlds, species, diseases, and scenarios.
The name Derp originates from the English language but ironically in Aftonian translates into "Dirp". The word has been modified to english standards.