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Lacking understanding. Not making sense. Nonsense.

The origin of Derp is easily found, but often wrong. Some claim it began with BASEketball, a 1998 film by the creators of South Park... which in turn led to the replacement of Chef by a Mr. Derp.

Close, but no cigar. The real origin predates 1998 by more than two decades... but Chef is a nice parallel with the original origin, which was surely the inspiration behind the name of his replacement.
The first appearance of the original was on The Muppet Show "Sex and Violence" which first aired in 1975.
The Chef in this case was Swedish. He never said anything remotely English, and spoke in a strange language that was strange enough to be almost Swedish.
Quite often he said something that often sounded like "Herp derp herpy derpy"

That is it. Pure and simple. Completely lacking understanding. Pöpcørn shrimpee. Herp derp.
Pöpcørn shrimpee. Herp derp.
Herp by Piss Miggy May 24, 2021
Herp
Half a Herp but found out later it was a dumpster bump
Herp by Dr.FatAnt.702 June 18, 2025

Herp Derp 

An expression used when a person, or yourself, has done somthing extremely stupid and dopey
Person 1: Dude, I just hit my head on the door.
Person 2: HERP DERP.
Herp Derp by Kommandant November 25, 2009

Herp derp 

When two people from different cultures have an outdoor wedding and the person officiating is Jewish.
That wedding was a total herp derp.
Herp derp by Jexlar January 7, 2018

Herp De Derp De Tittly Tum 

A phrase originating on South park. It was used to insult Rob Schneider and his various roles. Used to express that there's just no point in explaining how ridiculous his roles are.
Rob Schneider is...Herp de derp de tittly tum.

herp-slurp 

the act of obtaining herpes through oral sex. yes you can get herpes from oral sex. and even genital handshakes when there are no sores present.
that douchebag just herp-slurped that bundle of herpes infested joy.