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An exclamation following an instance of high-class stupidity. Like saying Herp Derp, only classier and more pretentious. Hand movements pantomiming a harp player are optional.
Melba: Oh hey, how's it going?
Numps: Can't complain. Oh, jeezum crow! I just stepped on a tack!
Melba: Haha! HARP DARP!
Numps: You classy bitch! Stop plucking those invisible strings!
by SaladOnTop April 22, 2011