Red Nose Day is an official Day of the year where the United States among other countries helps third world countries by feeding starving children and donating supplies and medical aid.
John Legend sang the song Lay Me Down on Red Nose Day.

Can I lay by your side? I'll take care of you and make sure you're alright.

-John Legend
by PWS27 May 9, 2017
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a memorably happy or noteworthy day
When Jack comes home from his tour of duty, that'll be a red-letter day.
by johnpqrtst July 15, 2005
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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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1. A particularly enjoyable or important occasion.

2. The day a woman menstruates.

3. In the Harry Potter series, the day one of the students receives a howler, typically in the Main Hall in front of everyone else.
The launch of one's first novel is a red letter day in any novelist's life.

She had her first red letter day last week. She spent all day sulking in her bedroom.

Another red letter day for poor old Ronald.
by Fearman October 25, 2007
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what your Granny called getting your period.
Its Beryls red letter day
by fert April 24, 2003
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beat a red head and clobber them with anything you find this day is on November 24th and lasts the whole week don't forget the bat
"beat a red head day is a day where all but the red heads are in we the non-red heads will beat the living shit out of red heads so you red heads better bleach that hair" - some guy who hates red heads
by redless faceless November 15, 2019
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A day where everyone can eat as much red velvet cake as they want!!
Kid 1: hey bro it’s red velvet cake day! You know what that means

Kid 2: let’s eat as much red velvet cake as we can!!!!!
by Lweasel37 November 1, 2020
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