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Similar to how the slang word "ion" is used but Uon instead means "you don't."
Uon have to buy Taco Bell if it'll make you poop.
by SlangDefiner May 19, 2016
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
No u backwards, this takes no u to another level
Mega bully: I am the most powerful being in the world! You have a small pp
You: u on
Mega bully: Fucking dies
by Mamzmzmskksskzp August 22, 2020
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3
This stands for β€œUndies Only Night” this refers to instances in which, due to temperature or mood, it feels right to only wear one’s undergarments during slumber.
β€œOh man *strips to undies* it’s an UON fam.”
β€œDawg last night was an UON ya feel?”
β€œUONs are a sacred practice that can, should, will, and are protected by one’s soul.”
by #17croissonicsandwhich June 29, 2019
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