protologism
A newly coined word or phrase defined in the hope that it will become common; a recently created term possibly in narrow use but not yet acknowledged.
This word is so new-fangled that it hasn't yet been accepted as part of the language—which makes it not a "neologism" but a "protologism."
Where it comes from
Coined by Mikhail Epstein in 2003, from Ancient Greek πρῶτος (prôtos, “first”) + Ancient Greek λόγος (lógos, “word”) + -ism, by analogy with prototype and neologism.
Adapted from the Wiktionary entry protologism (CC BY-SA 4.0).