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An individual who believes in and spreads the various myths and hoaxes associated with the termination of the Mayan long-count calendar on and around December 21, 2012
John Doe: Hey sis, did you hear that Woody Harrelson's a 'twelver'?

Jane Doe: A what?

John Doe: A 'twelver'. You know, someone who believes the world is going to end on December 21, 2012.
Twelver by The Truth: Live August 1, 2011
Noun
When you end up going to bed at/around 12 A.M., because you have too much crap on your plate / can’t focus on your work.

This term commonly applies to students who can’t cope with online school, but works with anything else.
“I had to pull a twelver again, they piled on too much work today.”

“I’ve been doing twelvers all week, when can I catch a break?”

“I had to do a twelver, but I still wasn’t able to get any work done.”
Twelver by ⠀ ⠀ ⠀ October 21, 2020
A group of twelve of something. Could be hours, cans of beer, a carton of eggs, etc.
I just slept a fat twelver and I'm about ready to die now.
twelver by BradTheDad May 20, 2020

d-twelver 

This word describes a poor white trash family, or families. The work is dirty dozen......
I saw some d-twelvers out there.
d-twelver by glock17 - Rick April 5, 2006

Twelvehitphobia 

A fear of 12 am kst, thinking Bighit will drop something.
I have twelvehitphobia.
Twelvehitphobia by BTStrash23 September 4, 2017

TTI (Tommy Twelve Inch) 

TTI is an acronym for “Tommy Twelve Inch.” Tommy Weiner, aka TTI attended Arrowhead High School and is known county wide as having a foot-long cock that dangles lightly above his knee cap.
Did you see that Kate is now is a wheelchair? Yeah man, I think TTI (Tommy Twelve Inch) devastated her box with his mammoth cock.