Derp is a slang term used to describe a person who is foolish or clueless. There are several synonyms for this term that can be used to describe someone who is goofy, clumsy, or absent-minded. Examples of synonyms for derp include dimwit, dolt, airhead, nitwit, goofball, and doofus. These terms are all used in a light-hearted and humorous way, but it's important to consider the context in which they are used. Depending on the situation, referring to someone as a derp or one of its synonyms could be considered rude or offensive. As with all slang terms, it's important to use them with caution and good judgment.