the one and only day that you might actually look forward to going to a math class, as many teachers allow their students to bring in a pie on this special occasion. unless of coarse your math teacher is a fucking nazi, in that case they might just spend the whole period ranting about how cool some retarded number that goes on forever is. yes thats right 3.14 is not technically pi, it goes on and on and on much like ancient old men who think shit like that is cool.
kid 1: "hey man wanna skip next period and smoke a j?"
kid 2: "Yeah... wait today is pi day! we cant skip math class today! we need to smoke now so we can take care of our munchies in there dude."
kid 1: "totally"
by Hannah Mmmmm March 14, 2007

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a day celebrated by math geeks across the world on march 14th
Nerd #1: Hey, did you know that the first 50 digits of pi are 3.141 592 6535 8979 323 84 6264 3383 2795 0288 4197 169 3993 751?

Nerd #2: Shut up, I know the first 1,000. Try it next pi day.
by mw23224 March 14, 2007

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March 14, the day when MIT hopefuls get slaughtered by the slew of rejections
College Forum:

m32smith: its pi day everyone, MIT decisions are out : )

chingchong41: REJECTED
2400 SAT
5.00 GPA
Tennis Captain
Intel Finalist

Oh noes!! I shame my family, my parents beat me!

wingwang99: This isnt good....
by manhandle March 14, 2010

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Everyone should eat pie on Pi day.
I eat pie on pi day.
by Primal Secret March 18, 2007

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3.14 is pi so it's celebrated on march 14 (3/14) It's like 4/20 but for math geeks.
John: Yay its Pi Day!
Terry: Dude, you're a tool to math.
by *Molly* March 15, 2007

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Pi Day is when the countdown to 4-20 starts. It is exactly 37 days away from this point. And for those who do not know what 4-20 is, look it up :]
it's pi day! 37 days left til 420
by itschelsaybby April 02, 2007

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a day thats been called pi day cause of the 3rd month on the 14th day. most men don't care cause its steak and BJ day
Piggy: 3.14! todays Pi day!
Jack: shut up fatty! I should be gettin a blowin from my lovely wife today! stick that in your "Pi" and smoke it!
by alex234 March 14, 2007

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