# derp

CEFR C2 · Noun

Source: https://englishreference.com/word/derp
Updated: 2026-05-31

## Definition

a word used to describe a silly mistake or a foolish person. It is often used online when someone does something clumsy or looks a bit strange.

For teachers: a foolish or silly person, or a mistake resulting from a lack of attention. Often used to describe a facial expression that appears cross-eyed or vacant; highly informal and common in internet subcultures.

## Examples

- I had a total derp moment and forgot my own phone number.
- The photo would have been perfect, but my dog had a major derp and stuck his tongue out right as the shutter clicked.

## Usage notes

- Often used as an interjection to acknowledge one's own stupidity or as a noun to label a clumsy act.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.