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Greenleafable
The correct answer is Colloquialism

Colloquialisms are words or phrases that are used in informal speech and show the language of the time or a specific social situations. Other names for colloquialisms are everyday speech, vernacular, casualism, general parlance, or a variety of other names depending on which linguist is doing a research on them.
Phenomenology

A word or a phrases that is informal and particular to certain time periods or social situations is called colloquialism.