The third monday of January that is the U.S. Federal Holiday for milk.
Milk day fell on 1/16/2012.

"what's MLK day? is it milk day? I think they forgot the "I" in milk #confused #????" - @AlexEbinger via twitter

"What is this MLK Day I'm reading about? Milk day?" - @Koji_Katsuragi via twitter
by slartbarg January 17, 2012
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Drink Milk tons of it doesn't matter if your lactose intolerant drink it.
Hey bro guess what?

Yeah man?

It's National Milk Day

Wait no.

Yes.

No.

Yes
by Daddy Father June 1, 2021
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Racist interpretation of Martin Luther King (MLK) Day. A common term for African Americans (Chocolate) and MLK (pronounced Milk) gives Chocolate Milk Day
"So, What're y'all doin' to celebrate Chocolate Milk Day?"
by Tizzle35 January 19, 2009
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A special form of the famous Milk Olympics, held annually on Martin Luther King Jr. Day, honoring both the birth of the reverend doctor himself, as well as the love of milk shared by Falls Church and JEB Stuart kids alike.

Just like Milk Olympics, MLK MILK Day often ends in "carnage. ie: excessive vomiting and shitting."
1: Oh man I am so ready for MLK MILK Day.
2: I dunno man, I thought you said you had given milk up after the last time.
1: I know what I said, but this time I think its gonna be different.

later that evening...
1: ITS COMING OUT OF BOTH ENDS!11!!1!1
by Alex Rock January 20, 2009
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Every March 10th were people challenge themselves to chug gallons of milk
I better buy milk for Mario Milk Day
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September 27th
The day of the year in which the most chocolate milk should be consumed by any individual.
"Hey, it's September 27th! Happy National Chocolate Milk Day!"
"Shucks, thanks Bobby! Happy National Chocolate Milk Day to yourself!"
by Nahyma September 28, 2013
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