Adj. 1. Something trivial, unimportant, or frivolous. Basically, anything that you don't give a shit about any more.
who cares if you got invited to the party of not? Don't be upset, that's so september-10th.
by Joaquin May 16, 2003
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10th of September was a natural but unfortunate occurrence, that devastated a lot of lives in the USA, the year 2005 has been called the year of extreme weather because of the a series of natural climate occurrences (scorching summers that ignited forest fires in Spain, devastating floods in Romania, Germany; tsunamis in Japan); these events were probably caused by the ‘green house affect’ and global warming
September 10th was a natural and unfortunate occurrence, it does not compare to September 11 that was a terrible tragedy caused by a group of people crashing 2 Boing 747 in the WTC.
by Delphi September 10, 2005
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One of the most revolutionary dates in all of human history.

Incase you were wondering, the joke is some guy says "whats 9 + 10" and some stupid kid answers "21" and haha the joke is 9/10/21 so cool we get to live through it lol, my family doesn't love me
"You stupid"
"No I not"
"What's 9 + 10?"
"September 10th, 2021"
"You stupid!"
by Stupid Af June 29, 2021
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When something is just so pre 9/11.
All these clothes I’m seeing are so September 10th. All my September 10th clothes are in the closet.
by Thoticus Su🅱️Reme December 3, 2020
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people who are born on 10th September are fine asf
guy: woah, they’re fine
Other guy: they must’ve been born on 10th September!
by tik tok: lonelysounds follow December 10, 2019
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the September 10th day was marked by Guestdremurr doing a unfunni joke to REDACTED, the joke was about REDACTED and it resulted in guest's ban
hey what happened on September 10th 2022: Nothing Happened.
by epicxgamerx232323xx January 20, 2023
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