A new word, phrase, or expression, or a new meaning for an old word.
coinage, slang, jargon
paleologism, old expression
Example Sentence #1
In Harry Potter, people such as the Dursleys are called "muggles", which is a neologism for non-magic folks.
Example Sentence #2
The word "doge" is a neologism stemming from a picture of a Shiba Inu dog on the internet, and is now used to refer to any dog in a funny manner.
Tom Haverford Food Nicknames