0000

Midnight, aka "four balls". In military time, this is the first minute of the day.

"What time is it?"
"0000."

by censored711man July 1, 2015

0000

The password for the most retarded persons phone.

Man 1 whats your password
Man 2 0000
Man 1*breathes in* BOI

by STAYCEEEEEEEEEEEEEEEEEEE December 18, 2017

U+0000

The Unicode null character, , which often terminates a null-terminated string. Its mere presence in a string (outside the end) will always cause software bugs. I tried to include the character itself (faulty PDF OCR from an underlined “가”, confirmed through a Unicode converter), but it would always cause UD to error (obviously).

I used empty brackets because I tried to insert the actual character, but Urban Dictionary would always

This character U+0000 is impossible to get into a string, and if inserted into a URL by %00, can unlock a security vulnerability called null byte injection

by O5-2 August 11, 2019

000-000-0000

A number that appears on telephones mysteriously at night when no one is around.

Usually it's a government spy trying to get a hold of you.

"Hey, that's wierd... I just got callled by a number 000-000-0000!"

"Don't answer, it's a government spy!"

by RaidenPrime May 26, 2009