The more phonetic way of writing/speaking out the Vancouver, Canada area code.
A: What's the phone number?
B: Well, A, it's Six Oh Four... ____ _____ ______ __________
by SIXOHFOUR November 15, 2007
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Something unknown. Someone who doesn't have a clue. Something that is missing. From the http code for unable to locate. "4-0-4 file not found".
He hasn't got a four-oh-four. Question: Do you know where you are? Answer: four-oh-four.
by james48843 November 27, 2010
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A problem. Derivced from the Internet error message "HTTP 404: Page Not Found".
Jesus fuck, what's YOUR four-oh-four?
by Macavity October 30, 2003
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Four-Oh is shorter way of saying "4.0" grade point average. In many American schooling systems, a student will get a 4.0 grade point average if they receive all As for all classes, all four years. Thus, the 4.0 GPA is a symbol of a student who has sold their soul to the devil to achieve perfect marks and will likely get into a renowned college.
"Is she really applying to Harvard?"
"Yeah, she's a four-oh so she's gotta aim high."
by exogenesissymph December 11, 2015
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The word is used to describe anything and everything that fits the phrase "bomb as hell".

Derived from the word "chill", as 40 degrees Fahrenheit is a pretty cool temperature; Four-Oh can replace the word "chill" or "cool" in any situation.
1."damn dude your car as dank as hell"

"yeah bro, pretty Four-Oh, huh?"

2. "Dang dude, we've been straight up loungin' for hours

"Yeah, today's been sooo Four-Oh"
by zsteezy September 4, 2009
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The derogatory term coined and used by Livonia Police for African Americans. The numerical 0-4 is an archaic code law enforcement once used in police reports for the black race.

The former code NIL (N-word In Livonia) used by Livonia Police was retired once a citizen cracked the code by listening to their radio communications from a police scanner. Due to the scandal, they implemented 'oh four' and switched their police radio to a private frequency that cannot be scanned by the public.
"We have to do a raid in Detroit because fucking oh fours robbed a bank in Livonia".

"Livonia is 90+% white yet more than half of tickets and arrests are oh fours".
by handIe007 December 6, 2020
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Driving on California Interstate 405, a major North-South connector in Southern California/Los Angeles West side, & being stalled in heavy commuter traffic often tripling commute duration.
"Are you on your way home?"
"Yeah but I'm four oh fucked right now near the Getty"
"Okay, I'll save you leftovers."
by Biobravo May 16, 2014
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