Definitions by Jeff the Pirate

pi day 

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

pi day by Jeff the Pirate March 14, 2007