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"
"Attention all patrolling units, we have had numerous reports of a high speed street racer on the 192 East."
"Uh, have you got any more info on this call?"
"Driver is currently in a black Atom 500."
"10-4, copy that. I'll be on the lookout for this guy."