This is the network term for "Unknown Error".

Similar terms are 404, 403, 500 & 613.
by Cmaza March 26, 2003
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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