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
What seems like a good day, 12/12 is about any day that is the turning point of someone's life, but not in a good way. It normally involves a loss in a lot of valuable items that may not cost a whole lot, but to the individual, priceless.
Jack lost all his weed on 12/12
by Jack Lay December 22, 2006
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
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
This date will not come again in our life time and is very special. It is also 9 days before said end of the world so its not so lucky but if you wish hard enough it could save billions of people from sudden death
friend 1: omg its 12/12/12

friend 2: so what's so important

friend 1: this is never going to happen again

friend 2: oh okay
by Sierra Madison December 12, 2012
The 12th of December 2012; everyone thought they'd die and the world would end
Omg it's 12/12/12 we're all gonna dieeeeee
by 5soschickenlicken February 4, 2017