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the 405

Interstate 405 runs north south through Southern California. Instead of saying "the 405 Freeway, Californians just call it "the 405".
Take the 405 to the 101...
by Boho chick May 1, 2014
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404

from the HTTP error "file not found on server" Extended to humans to convey that the subject has no idea or no clue - sapience not found. May be used reflexively
"Uh, I'm 404ing" means "I'm drawing a blank".
by Biohertz January 30, 2003
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404

To be 404'ed is to be given an invalid phone number, email address, etc. by someone you want to contact again after a pleasurable, but brief, encounter, as in a crowded bar with your friends crowding in on your action.
"Man, I hit on this fine chick last night at the club. I asked for her number, but when I called this morning I realized she 404'ed me!"
by Burro1949 June 11, 2006
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401 finger

middle finger salute, one finger salute, Trudeau salute
The middle finger, often displayed alone as a gesture to indicate anger or contempt. Named after the Ontario Highway 401 on which it is regularly used.
1. That idiot driver cut me off, so I gave him my 401 finger.

2. When landmarking for CPR, find the xiphoid process and mark it with your 401 finger.
by seren November 2, 2004
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404

(v.i.) Out to lunch; not having it together; acting in a stupid way. Typically derogatory.

Derivation: the "404: Not Found" error encountered when surfing the web.
That luser's 404!

Today in class, Hsu was 404.
by The Grammar Nazi March 19, 2001
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Error 404

Error 404, definition could not be found
by xXButtseXx January 9, 2015
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40404

The number that is texted with the desired tweet you want published.
SMS>New Message>To: "40404">Body: "i just got laid"
by hova09 March 27, 2009
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