Top definition
"day of the ninja" is a fake holiday created by ninjaburger.com in competition with "internationl talk like a pirate day". it is celebrated on december 5th. it is designed to celebrate ninja in all their glory. it is customary for those who celebrate to dress and act like ninja.
(december 4th)
dude 1: hey dude, whatcha doin tomorrow?
dude 2: bein a ninja
dude 1: what?
dude 2: tomorrow's day of the ninja. duh
dude 1: oh. sweet! i wanna be a ninja!
dude 2: then dress up as one
by seadracon October 09, 2006
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