1) Pertains to the marked days of a woman's bleeding "period" within the menstrual cycle, from the beginning to the end.

2) "Happy Red Flag Day" is a phrase often used in woman code to welcome one-another into the relentless, ceremonial unleashing of hell about life's problems, onto the ears of the unwilling-- mainly men. You may see this act transpire on Facebook with 12 guys asking "what does red flag day mean,'' followed by 37 "likes" on the initial post. The best means of avoiding this outcome is to remain silent and do not (repeat) DO NOT engage in dialog.
Girl 1: Hey youuu, happy Red Flag Day.

Girl 2: God, I know. I just want it to be over!

Guy 1: What red flag day?

Girl 2: You never listen to me, EVER! I'm leaving... ASSHOLE ::slams door::

Guy 1: ...What!? What the hell was that about?
by davidjkeys January 10, 2012
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To challenge the ruling on the field, i.e. call someone out on something that you believe is bullshit.

Derived from the NFL practice of coaches throwing a red flag to request further review of a play and give the network a chance to show 2 more minutes of commercials.
person 1 - My bad on not helping you out, I was working all day yesterday...

person 2 - I'll throw a red flag on that, you told me three days ago that you don't work weekends...

person 1 - Well, yea but...nevermind...
by JJ3672 December 10, 2008
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Person 1: “I love simping for Washington

Person 2: “weird”

Person 1: “You don’t? That’s a major red flag.”
by 69th_President July 5, 2022
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When you see a red flag, but you cannot run from him/her!

Person that is toxic but very attractive for somes reasons!
Edward was a real golden red flag but Bella was still ready to do everything to please him!
by Kyngofheartx June 7, 2023
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An antiquated term for a member of the communist party that attempts to cause political discourse and riots in an attempt to spread the word of communism
Arthur - "I'll tell ya, with all of these damn red flag agitators you'd think the world was going to end!
by The Rectifier. January 9, 2021
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Actions or statements that contain a large number of red flags
Girl 1: "What was up with that guy Jen brought to the party? He kept talking about chemtrails and women being subservient and all kinds of weird stuff"
Girl 2: "I have no idea, that guy was a whole bag of red flag behavior"
by deeveeesss June 20, 2023
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