Top definition
This is the network term for "Unknown Error".

Similar terms are 404, 403, 500 & 613.
by Cmaza March 26, 2003
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2
Poser, as in someone who misrepresents themselves while online.
"I did a 000 last night on IRC, said I was a horny 18-yr-old virgin to see how many pervs came out of the woodwork."
by tejas May 12, 2005
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3
the coolest way of telling your colleagues you'll be out of office
don't count on me, I'll be 000 tomorrow!
by ojv August 30, 2017
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