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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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2
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 January 31, 2004
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3
Something your girlfriend or wife would tell you if she's on menstrual period
Stop it bob, I'm on red flag!
by moshahriz October 30, 2015
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5
1) Traditional symbol of socialist resistance.

2) in an Orwellian reversal, also the song sung by Blair and his cronies at Labour Party Conference
Red Flag (song), Blair version:

We'll suck up to the ruling class
We'll fuck the workers up the ass
And just to show that we're sincere
We'll sing the Red Flag once a year.
by annoyed anarchist May 28, 2004
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6
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 January 31, 2007
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7
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 07, 2006
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