Wikipedia
Trumpiness is a neologism created by Stephen Colbert in an episode of the Late Show with Stephen Colbert that first aired on July 18, 2016. The word is a reference to the word truthiness, which was coined by Colbert's fictional persona in the first episode of the Colbert Report in 2005, and to the statements made by Donald Trump during his presidential campaign. According to Colbert, while truthiness refers to statements that feel true but are actually false, "trumpiness" does not even have to feel true, much less be true. As evidence that Trump's remarks exhibit this quality, he cited a Washington Post column stating that many Trump supporters did not believe his "wildest promises" but supported him anyway. In the segment, Colbert further contrasted truthiness with trumpiness by saying that "Truthiness was from the gut, but Trumpiness clearly comes from much further down the gastrointestinal tract."