Harp Darp
Harp Darp, also known as Herp Derp, is a rage comic face that first appeared on Reddit's f7u12 subreddit in May 2010 as a self-deprecating joke about a poorly drawn character2. The blank-eyed, lolling-tongue expression became shorthand for stupidity across the rage comic scene and even inspired a browser extension that replaced YouTube comments with strings of "herp derp"1.
Overview
Harp Darp, also known as Herp Derp, is a rage comic face drawn with a blank stare, a lolling tongue, and a slack expression that reads as pure vacant confusion1. Users deploy it whenever a character in a comic panel says or does something obviously dumb, which made it a staple of the rage comic golden age on Reddit and Tumblr2.
The phrase itself works two ways. Sometimes it labels a person as unintelligent, and sometimes it fills in for a word the speaker can't remember, functioning like "thingamajig" or "whatchamacallit"1. That flexibility is why "herp derp" outlived the drawn face and stuck around as generic internet slang for anything nonsensical.
Visually the character comes in a few flavors. The earliest version had thick eyebrows, but by August 2011 an eyebrow-less variant was circulating on f7u12 and became almost as common as the original1.