Sorry, but the "true" math geeks are waiting for March 14, 2015 at 9:26 and 53 seconds AM to celebrate. Until then, we'll keep our differential equations and T-distributions to ourselves.
We who celebrate Pi day don't get out very much.
by Jeff42 March 15, 2007
March 14th. A "holiday" celebrated by math geeks everywhere. Pi is approximately 3.14, and March the 14th is 3/14.
omg t3h pi day d00d, we are so 1337, pi roxxors t3h boxxors!
by aoiasimsd March 22, 2005
One of several days, notably march 14th, 3/14, and the 22nd of July, representing a common fractional approximation 22/7. It's somewhat of a pointless holiday, but it's always fun to annoy the hell out of people by being able to recite digits of pi from memory.
I'm currently up to 15-ish digits of pi for pi day. 3.14159265358979323
by Jeff the Pirate March 14, 2007
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
March 14th. A "holiday" celebrated by math geeks everywhere in USA and anywhere else the date is formatted MM/DD/YY. Pi is approximately 3.14, and March the 14th is 3/14 in America.
omg t3h pi day d00d, we are so 1337, pi roxxors t3h boxxors!

I know nothing about the outside world!
by Sam3453452 March 14, 2007
(March 14th)
A holiday celebrated by math teachers and geeks everywhere.
March 14th was the chosen day because pi = 3.14.
Since the next three numbers in the sequence are 159, at 1:59, everyone celebrating must say, "Happy Pi Day!"
And please, don't ask how I know.
J0HNNY: Oh my God! It's 1:59! Happy Pi Day!!
GEEK F0LL0WERS: Happy Pi Day!!!
J0CK: WTF?? Where's the pie?
H0HNNY && GEEK F0LL0WERS: Hahaha! Silly dumb kid!
by love x me <33333333333 March 16, 2007