Fake word 

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.

Fake word by sn33z3 May 7, 2011

Spuff (Fake Word) 

Spuff was considered by some, in the poorer parts of the UK, to be a usable word. Used loosely by youths in West coast areas.

Professor Legitshit, one of the UK’s leading linguists experts, has since put the word straight…. And said it’s not a word. He likened its use to the rape of the English language.

Spuff (Fake Word) - No known usable examples exist

Spuff (Fake Word) by RealWords&Facts December 15, 2023

fake urban dictionary word 

A word on urban dictionary that no one has ever used except them. Can usually be defined by a quick google search to check if one of the top three results is the words urbandictionary.com page.

http://www.urbandictionary.com/define.php?term=C+Cipher is an example of a fake urban dictionary word.

fake urban dictionary word by daveyx October 31, 2008