Local Warning 

An underground skate thrash band from Emmett, Idaho. Known for their grimey guitars, razor sharp screams, and their ability to play around 200 beats per minute. Also appreciated and criticized by some for their anti-violent lyrics and drug free stance. They have adopted the genre name "Peace Punk."

I hate violence but love punk rock! "then go listen to local warning."

Local Warning by RuskeAilgur September 3, 2009

Fallout Warning 

The act of announcing to anyone in the room to not enter the toilets for a specified length of time after taking a particularly heinous dump

Person 1: I'd give that about 20 minutes guys, I just deported some Romanians

Person 2: Thanks for the fallout warning

Fallout Warning by CaptainInnuendo August 8, 2017

hot warning 

A quick warning before someone gets into potential trouble

Wait, Adam. Let me give you a hot warning about this girl.

hot warning by deegotti December 13, 2017

meatball warning 

Eat meatballs to increase the chances of significant accumulation when snow is in the forecast.

A meatball Warning is now in effect for the tristate area. meaning there is potential for a plowable snowfall and the more meatballs you eat, the better our chances for snow! The impact would be from Sunday night into Monday. So if you want snow, eat meatballs from now until the timeframe mentioned above.

meatball warning by ellipsoidal May 14, 2018

mascara warning 

A term used for people with mascara on when an emotional moment comes up the mascara may mess up their face when they cry.

Commonly used on the BBC Radio 2 Breakfast Show with Chris Evans, where he warns listeners wearing mascara when he talks about something emotional.

Mark: Hey Lucy, Wanna watch Titanic with me? There might be a mascara warning.
Lucy: Sure.

mascara warning by Ipsylon October 8, 2018

Friendly warning 

a threat.

person 1 : "Hey, next time you come, things might not go well. Take that as a friendly warning."
person 2 : "yeah sure that's very friendly"

Friendly warning by Sossololpipi January 30, 2021

hurricane warning 

Hurricane warnings and watches are alerts issued by national weather forecasting bodies to coastal areas threatened by the imminent approach of a tropical cyclone of a tropical storm or hurricane intensity.

Since the hurricane season starts on the 1st of June and ends on the 30th of November shouldn't we be listening for a hurricane warning?

hurricane warning by Benjamin Newell March 4, 2021