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 by Notorious D.O.U.C.H.E. September 22, 2003

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