Derp is an expression associated with stupidity, much like the earlier forms of “duh” and “dur.” In image macros, the subject is typically portrayed with eyes that are pointed to each side and a caption that reads “.” The words “herp” and “derp” are often used in rage comics to replace nondescript names or parts of conversation. Derp is supposed to be much like a normal guy living life the way we do in his comics who faces the challenges of everyday life such as trolling. A lot of his comics are about him in class or talking to his friends such as Herp who is sort of his frenemy, and Derpina who is his girlfriend.
The first known instance of the word “derp” comes from the 1998 film Baseketball by South Park creators Trey Parker and Matt Stone. During a scene where they are caught smelling underwear taken from a woman’s private drawer, Matt runs out of the room and says “Derp.”
Rage Comic Usage