A word that you can't find in the dictionary and there is not a real definition is a Non-Webster Word, such as slander; there is no full definition, but you can tell when something is slander through experience
This is a phrase into a word which is unnecessarylong to become a word, but why not add it?
A: Dude, I got this random word I wish was on Webster...
B: Bro, What is it?
A:Bippity-boppity-doo, which is a word-by-me-which-no-one-knows-or-uses-because-it-is-not-in-the-Webster-dictionary-so-I-wrote-this-word-in-the-Urban-Dictionary-site-which-gets-my-creativity-of-words-into-action.
B: You wrote it into Urban Dictionary???
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2 million.