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A day that a large portion of American Citizens spend throwing up and/or sleeping.
"I hate living through March 18ths"

"Wow, no one is out today. I swear, it is March 18th"
by treeclimber79 July 05, 2009
the day all irish ppl go for the cure
hey ryano its march 18th, i need the cure after paddys day
by paddytheninja March 14, 2011