CNR 

Could Not Reproduce.
Used by webcomic XKCD.com

"Speech2Text Commander: Bug #167801 'Speech Recognition fails on young child voices'"
"Girl: Hmm"
"Girl: Hey, can you do me without a condom? We need a young child for something."
"Guy: Okay"
"Pregenancy Test: I (II = Pregnancy, I = not Pregnant)"
"Bug 167801: Status: Closed Reason: CNR"

CNR by BlargGalore May 12, 2009

CnR 

1.Cops and Robbers, a game usually played by kids based on robbers and cops chasing them.

2. A GTA:SA-MP game mode based on the earlier concept

3. Could not resist.

1.
Carol: Hey, wanna play some CnR?
Bart: Sure, I'm the robber!

2.
Mike: Ok, where do you wanna play?
David: Me likes a CnR server!

3.
Jon: Hey, you headshot me!
Dan: Sorry, cnr!

CnR by maxmanapple February 21, 2010

cnr 

Abbreviation for cancer used often in League of Legends because it isn't on the list of bannable words.
Means either "bad" or "extremely".

"dont ping me cnr random"

"hes cnr fed, next"

cnr by Zeus2459 July 30, 2022

CNR 

Clinical Notes and Records

We request all CNR of patient X.

CNR by lawqueen August 3, 2023

TS; CNR 

Too Small; Could Not Read

Used to denote the incredibly tiny text that appears in screen captures of message boards or Twitter posts.

"This guy just sent me a copy of a conversation but it appears to have been through a shrink ray. TS; CNR"

TS; CNR by flashwildecard September 12, 2014

CNRK 

Stands for Chuck Norris Roundhouse Kick, the measurement of pure destructive force.

The closest thing to 1 CNRK was in '79 when Godzilla was hit by 28 Boeing 747's and 12 trains, all carrying nukes. That was .00001 CNRK's. Then, in the midst of the chaos, David Hasselhoff flexed his biceps, raising that to .0002 CNRK's.

Chuck Norris was on vacation in Tahiti at the time, but when he found out that someone referenced HIS trademark measurement, he sent a roundhouse kick that demolished half of Tokyo, killed Godzilla (and 10 of his clones), and temporarily crippled Hasselhoff.

CNRK by Ninja (is better than pirate) January 23, 2008

CNRhK

A crucial element of the universe. Stands for "Chuck Norris Roundhouse Kick".

Scientist have estimated that the energy given off during the Big Bang is roughly equal to 1 CNRhK.

CNRhK by Jaime Duck February 8, 2009