1.)Describes things that people claim to know,something like a gut feeling.
2.)Straightforward truthfulness.
3.)Being a badass and reinventing the word truthiness without even knowing.
"You dont look up truthiness in a book,
....you look it up in your gut!"
(words from steven himself.)
A word that New York Times made up because they couldn't spell truthiness. Stephen Colbert, upon discovering this (he created truthiness), made his next "Word" Cat, so that the Times could have an easier time getting the word right.