Neologisms are words and terms that have recently been coined, generally do not appear in any dictionary, but may be used widely or within certain communities. Protologisms are words that have not yet caught on widely.
Some neologisms and protologisms can be in frequent use and it may be possible to pull together many facts about a particular term and show evidence of its usage on the Internet or even in larger society. It may be natural, then, to feel that Wikipedia should have a page devoted to this new term, but this is usually not the case. There are several reasons why articles on (or titled with) neologisms or protologisms may not be appropriate:
One reason is that Wikipedia is not a dictionary, and so articles simply attempting to define a neologism or protologism are not suitable for Wikipedia.
Another reason is that articles on neologisms or protologisms frequently attempt to track the emergence and use of the term as observed in communities of interest or on the internet — without being able to attribute these claims to reliable sources which are verifiable and independent of the subject. If the content is unverifiable then it constitutes analysis, synthesis and original research and consequently cannot be accepted by Wikipedia. This is true even though there may be many examples of the term in use.
In many cases, articles on neologisms get deleted. Articles on protologisms are almost always deleted as they are often created in an attempt to use Wikipedia to increase usage of the term. To this end, pages on neologisms are not being accepted by the Article Wizard at this time.
As Wiktionary's inclusion criteria differ from Wikipedia's, that project may cover neologisms that Wikipedia cannot accept. If you are interested in writing an article on a neologism, you may wish to contribute it to that project instead.