A neologism is a word or phrase that has entered into a language from a book, movie or event. It is not formally accepted but many (if not most) people know what it means.
Some examples are
- bunny boiler
- Catch-22
- Scrooge
- Banana Republic
- Beatnik
- Factoid
- Gremlin
- Meme
- Grinch
- Cyberspace
- Guy-Cry movies
- Chick flicks
- Spam
- Crowdsourcing
- Brangelina
- Muffin Top
- Bingo Wings
- Backne
- BFF
- App
- Troll
- Metrosexual
- Bromance
- Vaguebooking
- Hipster
- Workaholic
- Cankles
- [insert word here ]gate
You made my day. I have not laughed so hard in a really long time.