12s (12er in German language) are all people, who were born at a date, where the amount of milliseconds of the current system time had 12 digits. That includes people that were born between 1973 and September 2001.

While people older than 12s usually are a bit unfamiliar with the internet, 12s are said to be the coolest people in the virtual world. The younger 13s are notorious for being cringe on the internet.
"You're a 12s? Wow, so cool, I wish I was also one of the 12s!"

"Oh cool, another 12s. I was slowly losing braincells in this mass of 13s.
by schneeeee May 24, 2021
Get the 12s mug.
The Seattle Seahawks' dynamic fan base. Regarded as the unrivaled loudest, proudest, most enthusiastic fans in the history of the NFL.
The 12s were in full force at Super Bowl 48; their crowd noise caused the safety to open the game because the Denver Broncos could not hear the snap count.
by Pooh Harrison February 3, 2014
Get the 12s mug.
A day that is significantly luckier than 11/11/11 that everyone should expect to make their biggest wish on.
12/12/12 is much more lucky than 11/11/11!
by dwightonmac54 November 11, 2011
Get the 12/12/12 mug.
The date that comes after 12/11/12. Has no real significance in the way we live our lives.
Person 1: Do you know what the date is!?!?
Person 2: Wednesday?
Person 1: No! It's 12/12/12
Person 2: No, I'm pretty sure it's Wednesday.
by Skitzophrenic December 12, 2012
Get the 12/12/12 mug.
Masturbating or ejaculating 12 times in 12 hours.
Dude, last night Bobby was challenged to the 12 in 12 challenge and he accepted! His dick's gonna fall off!!
by Tigs978 December 2, 2009
Get the 12 in 12 mug.
The lighting schedule for growing marijuana indoors. 12 hours of sunlight/12 hours of complete/uninterupted darkness.
Just finished the veg cycle, now its time to change from 16/8 to 12/12 in order to determine the sex of my plant.
by amp9041 January 2, 2006
Get the 12/12 mug.
a 12 for 12 is when you have sex for 12 hrs straight. A 12 for 12 can either go from 12 am to 12 pm or 12 pm to 12 am.
I met this girl and craziest thing we went 12 for 12 homie.
by WestCoastKing03 July 14, 2022
Get the 12 for 12 mug.