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hapax legomenon 

n. A word or form that occurs only once in the recorded body of a given language.
schwonk: an uneducated phrase or comment.
UD goons might want to put that one in the archive.....

©uh-uh-uh

Hapax legomenon 

noun (pl. hapax legomena or hapaxes)

A word that appears only once in a text corpus or body of writing—be this a particular author's oeuvre, a work of substantial length, or a language's entire collection of writing, including the Twittersphere.

From Ancient Greek hápax legómenon ("thing once said").
The old Ottoman Governments regarded this clan of manticratic peers with a mixture of reverence and distrust.
—T. E. Lawrence, 1926

Despite the constant negative press covfefe
—Donald Trump producing a hapax legomenon of his own, 2017
Hapax legomenon by DrSJohnson January 30, 2020

hapax legomenon 

the fuck should i know?
hapax legomenon by Duke September 24, 2003

Hapax legomenon 

A Hapax legomenon is a word or expression that only occurs one time.

This can be abbreviated as Hapax.
There is this one word in a book that I found that is only mentioned once. This is an Hapax legomenon.
Hapax legomenon by Noah Armon June 1, 2022
person-1: dude who downloaded all these bara images on my computer
person-2: idk but its prolly a lenome
lenome by somedudeidontknow November 26, 2023

Hapax legomenonist

1. A person who coins new words or terms (such as "hapax legomenonist"). From "hapax legomenon," a longstanding linguistics concept referring to a term of which only one instance of use is recorded (based upon the Greek roots "hapax," for "once," and "legomenon," for "to say"). 2. (rare) A person who creates an entirely new Lego character out of various Lego pieces from different sets.
Scott: Wow, that Urban Dictionary is like a Star Trek convention for hapax legomenonists.
EJ: You took the words right out of my mouth.
Hapax legomenonist by FitofPeak August 23, 2026
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I had a trucker's tan after driving for 10 straight hours on a sunny day.
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