You look down during the day to notice your member sitting larger than usual (n.b. refers to a larger than average floppy length and/or girth). CONGRATULATIONS - you are having a big dick day!
A smiling Jim emerges from the bushes having taken a quick whizz. "Great news... I'm having a big dick day" says Jim to his friends. Friends are happy for Jim (some high five).
by Ben UK 2010 June 12, 2010
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When you organise a spectacular military parade to say, "Tanks" to all your dictator friends.
Did you see all those Russian tanks at the inaugural Big Dick Day?
by No Hemingway July 3, 2019
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November 13th. A day for all of the gents to celebrate their endowment. The first National Big Dick Day was started in 1798 by John "Big J" Dickinson, with the date chosen to be his birthday. The validity of Big J's claims is disputed.
Matt: "How did you celebrate National Big Dick Day?"

Nate: "Not allowed to."

Matt: "Damn."
by Billiam27 June 5, 2021
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Lawson: I love my body
My DICK: yeah me too
My DICK: I love dragging around
by OSC ThiccLaw April 21, 2019
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May 26 every one born on this day has a big dick
I'm reddy or big dick day
by its big boy November 8, 2019
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September 3rd

A day to appreciate the men who have big dicks.
Did you get John a present for Big Dick Appreciation Day?
by HISTGD September 3, 2021
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