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Why you stuck-up, half-witted, scruffy-looking...nerfherder!
— Leia · Star Wars: Episode V - The Empire Strikes Back

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The insult builds through three unflattering descriptions before pausing and landing on nerfherder. The accumulation suggests irritation, while the unusual final word gives the outburst its comic shape. One reading is that the speaker is searching for a suitably forceful ending and finds a wonderfully odd one.
Context reviewed