23. "Truthiness" is actually a word that dates from the nineteenth century. But which 21st-century television host and comedian imbued it with a new and trendy meaning in 2005, as a comment on modern times?
From Quiz To Kill the Truth
Answer:
Stephen Colbert
"Truthiness" in this case means the quality of seeming or being felt to be true, even if not necessarily true. Stephen Colbert, in his faux-pundit persona, used it as "Tonight's Word" on his TV program, "The Colbert Report" in 2005. Colbert described how he arrived at the concept: "Truthiness is a word I pulled right out of my keister".
Yet, the word already existed in the OED and other dictionaries of the English language. In the 19th century, truthiness was a synonym, without irony though with some levity, for "truthfulness"; and "truthy" meant "faithful" or "true". Computer programmers started using "truthy" in the 20th century to mean something else. In Boolean logic, an expression can evaluate to TRUE or FALSE, or more precisely, to 1 or 0, turning a relay or transistor ON or OFF. A "truthy" expression evaluates to 1, and a "falsy" expression evaluates to 0.
Be that as it may, in 2006 'Merriam-Webster Dictionary' named "truthiness" its Word of the Year, as did the American Dialect Society the year before. The 'New Oxford American Dictionary' added the new "truthiness" sense to its entries, and credited Colbert with its origin.