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1.
SKEET! (originally created as a part of an elaborate code system used by lifeguards in the early 21st century)

see skeet
1.) Aww crap! I have code 12 in my hair... again!

2.) Code 12!

3.) Oh gosh... I'm about to code 12.
by lifeguards September 27, 2006
 
2.
Clean slate and I’ll buy the first round

That is... all previous shouts or rounds are forgotten and I will get the 'first round' (the next round to be bought)
Tony: Greg, I owe you a beer
Greg: All good - I call Code 12.
by BeeryMcBeer July 23, 2012
 
3.
A joke for computer technicians, when helping someone fix a computer related problem.

Code 12 means the problem is 12 inches in front of the screen.
Person 1: "Argh, the internet isn't working. I can't see Google."

Person 2: "We've got a code 12!!!"
by Aaesos March 11, 2014
 
4.
Term used to describe a member of the opposite sex that may not be attractive to the majority, but is very attractive to a particular individual.
A: Gina is HOT.
B: Dude, she's a 5 at best.
A: Fine, she's one of my Code 12's.

I know that Christa isn't gonna be in Playboy anytime soon, but she's Code 12 to me.
by Chilkoot Charlie May 29, 2010
 
5.
When a female speaks and you want to just slap her across the face with your massive cock because she's so stupid.
Female: "Wait... the Earth is the center of the universe right?"

Man:"CODE 12!!!!"
by Tervor June 15, 2010