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the day of the week that was formerly known as Thursday or even "thirsty Thursday". A combination of the two to form a much easier word. Orgin- THE Michigan State University
"you better be going out tonight, its Thirstday"
by A. DUKE August 30, 2007
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A Thursday night in which one attends the Neon Cactus in West Lafayette, IN. On Thirstday, one is serenaded by Piano Man Bruce whilst partaking in $1.75 32 oz. mixed drinks. Boiler UP!
"Yo Kelsey! Happy Thirstday man! Don't get anyone arrested at the Cactus tonight."
by NotPurdueSports July 06, 2012
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An additional day, before Friday to get your drinking and partying on!
DAMN!! I wish is was Thirstday I need a glass of wine!!!!!!!!! or a whole bottle :)

Damn, I wish it was Thirstday so me and Lane could go to OTR!!
by qtruntme July 19, 2011
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The thursday before your senior break, your senior spring break, and the thursday during your senior break. On this day you have to at least get like ONE HUNDRED PUSSIES. Yeah put up all your fingers then multiply that all your fingers again, yeah thats a fucking hundred pussies in one fucking day.
Guys it's thirstday. Time to get a hundred pussies in one fucking day, multiply that number by the four of us and we will be getting more pussies than there are days in a fucking year. I'm so Thirstday for pussay.
by Crunkwell January 14, 2009
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