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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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the flag of no quarter. used by pirates, the red flag was flown from the pirate ship when a merchant ship pirates were targeting offered resistance.

no quarter means that the pirates intended to take no prisoners.
some buster smoke up all my smokin' weed.

show him the red flag.

no quarter for dat sucka!
by zen December 1, 2006
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