Often used on YouTube as a compliment. Use of this term does not mean that a video is actually flagged, but that the content of the video was so awesome that the viewer thought it was sexy.
by xldr July 11, 2010

During sex the most patriotic man will super glue a flag to his penis and wave it as the others suck him off. This is a way to show true American heritage.
In premarital sex between men of mixed races usually between 6 and 10 men there will be a man to pull the American flag shaft.
by Theamericanshaft February 10, 2022

1. A marathon of riding roller coasters at any of the Six Flags locations
2. A period of intense sexual intercourse; a test of endurance.
2. A period of intense sexual intercourse; a test of endurance.
1. You'all have a Six Flags day (common statement issued at the Six Flags amusement park).
2. Boy, did she give me a Six Flag's day.
2. Boy, did she give me a Six Flag's day.
by Horseburger April 4, 2010

by Dfragmented March 19, 2003

by Laurfarsarnar August 7, 2013

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.
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?
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 11, 2012

to masturbate savagely.
by GEArSofWAr873 July 7, 2010
