Top Definition
A billennium is an event celebrated every billionth second from the time since 00:00:00, 1 January 1971. Unix enthusiasts have a history of holding at time_t parties, to celebrate significant values of the Unix time number.
At 01:46:40 UTC on 9 September 2001, the Unix billennium (Unix time number 1,000,000,000) was celebrated.
by Pachanka November 01, 2012

The Urban Dictionary Mug

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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