Flex is a slang expression for showing off with your assets, be it physical, financial or mental; it is to boast with your superior position to others.
People, who “flex” too much are considered rigidly arrogant, egocentric and exaggerated.
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The term had been in use in African American Vernacular English as a slang term for showing valiance, or bragging since the 1990’s.
The expression appeared in songs like Ice Cube’s Today Was a Good Day since 1992.
The term comes from the act of flexing one’s muscles, to show the physical capabilities, often right before a clash.
This had been adopted in a more metaphorical way, to express the same meaning when people “flex” with their riches or intellect.
Spread and Usage
Urban Dictionary has definitions on “flex” written since 2003.
- Urban Dictionary – Flex