It’s kinda flipped from how most people think of it. Dictionaries don’t define which words the language contains–they just write down the meaning of words that people are using. Any word that’s used commonly enough will be added to the dictionary. Webster also has “rizz”, for example. That just popped into common usage a couple years ago and definitely wasn’t coined by a dictionary.

My favorite nonsense words lately have been from Australia. They have whipper-snippers, grow Warrigal greens, eat wombock, and chase off bin chickens. Giving language a purple-nurple is practically the national Aussie pastime.