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Duh; a twelve pack. usually of beer but can be soda.
Duude! He downed my whole twelver!
by jimmyvix May 14, 2010
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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.
by The Truth: Live July 31, 2011
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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.
β€œI had to pull a twelver again, they piled on too much work today.”

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

β€œI had to do a twelver, but I still wasn’t able to get any work done.”
by β € β € β € October 21, 2020
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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.
by BradTheDad May 20, 2020
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