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 20, 2016
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This stands for “Undies Only Night” this refers to instances in which, due to temperature or mood, it feels right to only wear one’s undergarments during slumber.
“Oh man *strips to undies* it’s an UON fam.”
“Dawg last night was an UON ya feel?”
“UONs are a sacred practice that can, should, will, and are protected by one’s soul.”
by #17croissonicsandwhich June 30, 2019
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