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1.
APCO 10-code for "I understand your transmission"
Fairfax to car 459, we've got a 10-50 on 95 south of exit 150

10-4
by IrishRepublicanArmy May 24, 2004
 
2.
10-4 means "OK," "understood," and "affirmative." Commonly known as CB radio lingo, originating from the need for brevity in radio transmission.
me--"Is anyone there?"
respondent--" 10-4"(to indicate presence).

me--"Let's roll."
respondent--"10-4"(to indicate agreement).
by Mis2y September 21, 2006
 
3.
An acknowledgement
ME: Whats your location
YOU: Just crossing the bridge
ME: 10-4
by Rick Brock March 07, 2004
 
4.
104
A term for the semi-canon slash relationship between Watanuki Kimihiro and Doumeki Shizuka in CLAMP's xxxHolic manga/anime. It is derived from the combination of the first two kanji in the characters' names: "hyaku" or "dou" (100) for Doumeki, and "shi", or "yon" (4; neither of the normal readings are used in Watanuki's name) for his love interest. Because the xxxHolic fandom is not large, and eventual 104 is (very) strongly implied in the plot, the terms are pretty much ubiquitous. 104 is also called donuts.
It's been a while since I worked on any 104 fanfic...
by DouWataAddict August 21, 2007
 
5.
Means Ten Four
Actnollegment of a statement
That was a nice shot!

10 4
by b December 11, 2003
 
6.
It is a descriptive term used to alert fellow gentlemen of an imidiate sighting or a recent encounter of a highly attractive female specimen or simply beautiful girl.

This term is broad and can be interpreted in many ways.

This term is is used generally in public and unknown to women so fellow gentleman can speak the term in public without the target being aware.

This term does not apply to sluts, milfs, etc.
Hey boys "10-4"
by FDez March 18, 2014
 
7.
1: noun, ten·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