Flex
Etymology
From "flexing" one’s muscles to show them off, the metaphor moved through hip-hop into general slang for showy displays of any advantage. The phrase "weird flex but ok" became a viral meme around 2018, cementing "flex" as a countable noun for a specific boast.
noun · /FLEKS/
An ostentatious display of wealth, skill, or status meant to impress.
What it names
A word for showing off treated as a distinct social act — the deliberate parade of something enviable. It also lets you rate the performance: a "weird flex" is a boast about something no one would actually want to brag about.
Example
Announcing he sleeps only four hours a night was a weird flex, but ok.
Related idea
Where drip is style you’re wearing, a flex is the act of displaying any advantage — money, talent, or free time.