Top Definition
Y2K's lesser known brother, supposed to happen in the year 2010, which like Y2K was disproved over time
(31/12/2009, 11:59:59 PM) "OMG it's Y2.1K! WE'RE ALL DOOOOOMED"

"oh, nothing happened...again"
by billybob1236696 April 18, 2010

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