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Zombie Awareness Day also called Easter by Chirstians. A day memorializing the second documented zombie case in history, the first was a guy named Lazarus. An important historical event to note prior to the Zombie Apocalypse.
I'm sharpening up my swords on ZAD day, just in case.
by dustmans April 24, 2011
synonym of awesome, pwnage, or kickawesome.
guy: dude, i just got a new psp!!!!!1!1!!1oneonetwelve

dude: zads!
by not_you_but_me June 20, 2008
zombie apocalypes defense system
Tim do you have a ZADS????
by awesome-o9685 January 29, 2009