Herpa derpa is nonsense babble. When someone says something that makes no sense and sounds absolutely stupid you can respond with "Herpa derpa" as a quick painless way to avoid further conversation with whoever makes an idiotic statement. People use it to point out a stupid or ignorant remark or behavior.
"I'm going to jump off this cliff and fly to the moon with my arms."
"Herpa derpa?"
The methed out wimpy guy who sleeps with your girl while you are away.
Man dude, that guy's pulling a Darin Durbin on me. If I ever get a hold of him I'll rip him up.
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