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Wiktionary
derp

interj. (context slang English) (non-gloss definition: Draws attention to an act of foolishness or stupidity.) vb. 1 To act stupidly or foolishly 2 To make a stupid mistake

Wikipedia
Derp

Derp may refer to:

  • Mr. Derp, a minor character in South Park, a show that popularized the Internet slang word derp.
  • Egmond aan Zee, a village in the Netherlands commonly referred to as Derp by locals.
  • Drug Effectiveness Review Project
  • D.E.R.P., a robot character seen in the Fresh Beat Band of Spies episode "Dance Bots"
Derp (hacker group)

Derptrolling (sometimes referred to as Derp) is the name of a hacker group that was active from 2011 to 2014. They largely used Twitter to coordinate distributed denial of service attacks on various high traffic websites. In December 2013 they managed to bring down large gaming sites such as League of Legends in an attempt to troll popular livestreamer PhantomL0rd. Public reaction to their presence has been generally negative, largely owing to the unclear nature of their motives.