a sign or warning of any impending danger, disaster or doom
when my gf called me up that day and gave me the "we need to talk" line, a red flag obviously came up and I figured I'd soon be on the outs with her.
by Bungalow Bill November 18, 2006
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1. a warning sign

2. subject to a warning
A funnel cloud is a red flag for the formation of a tornado.
by The Return of Light Joker October 16, 2009
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a bad sign of what’s to come
I think the first red flag was when my supposed date started lying to me a lot.
by nlolhere June 29, 2020
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Stopping what you're doing because because something has made the environment unsafe. Derived from the racing flag that is used to stop a race because of unsafe conditions.
"We're red-flagged at this gas station because it's snowing too hard for us to be able to go on."
by D2RCR February 1, 2004
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The traditional color flag of the Blood gang
Dave:Look at that Krab with his blue shit!
Ed:Yeah us Bloodz wear that red flag til we die!
by Jasmine C tha G January 7, 2006
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term used to cut someone off from drinking for the night.
(girl stumbles around and ends up puking on someone's shoes at a party)
Some Dude: YO, That bitch is red flagged! Get her outta here.
by meeeeecrock February 1, 2007
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