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Y-code: A US Naval Aviation term meaning that it was a piece of equipment that was recieved bad from the repair shop. The part that the O level was trying to replace was defective when it was installed on the plane. If you are the technician that worked on the gear then you will get into trouble for sending out faulty gear. That is if the Y-code was found to be Valid. Y-codes are the technicians nightmare.
Harris: "Dam man I got Y-code last week on that ducer that I fixed."
Cortes: "Well was it a valid Y-code?"
Harris: "Hell no it wasn't. Stupid as O level techs. I was forced to A-799 it back to them with a little note attaced"
Cortes: "What did the note say?"
Harris: "It said Next time try the on/off switch dumb ass"
Y-code by b--rad September 25, 2006

Code Yellow 

A family-friendly way of denoting a urine incident or the threat thereof. In other words, someone just peed or needs to badly. It's perhaps most often used by medical professionals, who frequently have to use other codes so code yellow just fits right in.
CODE YELLOW, ARTHUR WET HIMSELF!
Code Yellow by Tsovoa July 4, 2019

Code Yellow 

A code called at Linden Oaks Mental Hospital. It's used when a patient goes completely ape shit and the only thing left to do is to lock them in a room and inject Ativan in their ass.
"Code Yellow in adolescent. Code Yellow in adolescent."
"I bet that's Karlee."
Code Yellow by Luna Tick May 10, 2012

Code Yellow 

When a girl or guy stares at another guy or girl who they think is cute for long period of time (stalker like). This is to be used as a warning to warn the person that someone is staring into the very depths of there very soul for 5 hours without taking any breaks. Its is best to avoid a Code Yellow if at all possible to prevent any discomfort! To warn someone of a Code Yellow, just say "Code Yellow" or, for singal purposes, say "Yellow" in sign language.
"He/She won't take their eyes off you! CODE YELLOW! RUUUUN!"
Code Yellow by ForbiddenProdigy October 26, 2011

code yellow 

when someone's friend is so scared, they pee their pants at the teacup ride at an amusement park.
ex: hey I think Ivan pissed his pants on the teacup ride at Great America!!
- Haha! code yellow
code yellow by @dango.walker October 20, 2019

yk___code 

Yk____code is the best Anitoker that can never miss.He only gets W’s and never misses.He is a funny guy and very smart.He can only hit W’s and it is impossible for him to take a L.He is one of the best anitokers ever.He also has a take where Kanike is the best Mc(which he is)..since he can’t miss Kanike is the mc and aot is the best anime(take by yk____code)
Bro do you know that guy yk___code he is funny and gets W takes
yk___code by stonejackson23 April 22, 2022