Those are called "buzzwords" or "fad words," which are trendy terms or phrases that become popular quickly but fall out of favor just as fast.
Slang
mnemonic
Fashion trends that are popular for a short amount of time are called fads. Fads tend to pick up popularity quickly, but also tend to end just as fast.
mnemonic
The name Lynne can be short for Lynnette or Linda. However, being called Lynne myself, some aren't abbreviations of a name. Lynn is more popular, as Lin as less popular to Lynne.
Words that are opposite or nearly opposite in meaning are called antonyms.Examples are big and small, or long and short. Not all words have antonyms.When two antonyms are used together for effect, it is called an oxymoron.(see the related question)
An anecdote, a riddle, a joke. While a very short, short story could be told in 100 words, a written story should exist in closer to a thousand words. Most short stories for that matter are more in the neighborhood of five to ten thousand words.
"Pop" is short for popular just as fan is short for fanatic.
Sandy is short for Alexander, and is popular in Scotland, especially coastal regions. my wee boy is called 'Sandy Dod' Short for Alexander George it can also be used for a Female, popularised by the hit Movie- GREASE
The literary dialect is called Australian Standard English, or Standard English for short. Popular speech is commonly called English or Australian (pronounced "strine").
The A has a short a sound, as in pass and task. (the short A says ah in some words, but not in short words such as cab, am, an, and mass)
because it is only popular for a short time like how they put sea salt on all desserts