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A term indicating you have received and understood a message, and confirm it.

As it is used by law enforcement, using the term is a indication you suggest the receiver is a fascist.
- Please leave Sir, without making a scene
- 10-4 you fascist pig
- Fuck you hippie
by Mamas little school boy August 31, 2019
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A girl who is a 10 from far away but a 4 from up close.
"That girl over there is hot!"

"Here she comes.."

"Wait...nope...we got ourselves another 10-4."
by gdub205 October 18, 2006
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10.4 is the version name of Apple's OS X Tiger. Therefore, 10.4 may be used as a substitute for the word 'tiger'.
What's the matter, 10.4?
by GP April 26, 2005
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Way Of Parting An Ending A Conversation !
I'll See You Tomorrow. Ok 10-4 !
Someone Is On The Other Line I'll Call You Back 10-4.
Ay Hitt Me Up Tonight Before You Go . 10-4
by ZoneSix December 07, 2010
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1: noun, tenΒ·four
Phrase used as acknowledgement, either at the start or the end of a meeting between friends; can be used in place of hello or goodbye effectively.

2: adjective
Used to describe mood, person, or occasion; meaning above average or rather good.
"10-4 mate how are you?"
"I'm 10-4 thanks, did you go to the Roxy music gig last night?"
"Yeah, Brian Ferry was immense, and I pulled!"
"Cracking stuff mate, what was she like?
"She was 10-4"
"Good times, OK mate, catch you later! 10-4!"
"10-4"
by alzum July 11, 2013
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An affirmative response used in emails by douchebags who always wanted to work in law enforcement but failed the psychological evaluation.
Employer (email): The Monday morning meeting has been pushed from 8:30am to 9am. Thank you.
Employee (email reply): 10-4
by Viking Wisdom October 02, 2019
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