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
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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