A word that is made up by someone or a group of people to replace a word for a definition they don't know. They are often used to display intelligence when their true intelligence fails them.
Person A: I am going to "zingle" with my buddies tonigh!
Person B: uh.... Zingle is not a word....
Person A: Nooooo, it's a legit word!
PErson B: No, its a Fake word that you made up.