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Niner

A shorthand term for the events of September 11th, 2001, generally used in a lighthearted euphemistic fashion. "The Big Niner" is a common formulation to refer to this.
"Have you seen the Nat Geo documentary 'One Day in America?'"
"Of course, it's one of the most comprehensive films on The Big Niner ever made."
by JohnnyHotcakes99 January 27, 2022
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oon-deuce-niner

Customer "how much is this slurpee?"
Chailott "brotha, it be a oon-deuce niner"
by g-birdman March 28, 2003
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Seventy Niner

A person who is mentally challenged and their IQ is borderline mentally. Where they seem normal but cannot go deeper into a subject.
This guy seemed normal, but after trying to dig deeper into the subject I realized he was a Seventy Niner.
by Seventy Niner February 2, 2026
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