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2.
A weekly celebration of the awesomeness of raisins, chocolate-covered raisins and other raisin related memorabilia, usually celebrated by buying a bag or two of raisins and fangirling about them
Person 1: Hey guess what day it is today?
Person 2: Hmm, I don't know!
Person 1: RAISIN THURSDAY!!!
Person 2: OMG LETS BUY SOME RAISINS!!
by personalitydementor May 17, 2012
 
1.
When you come into work on Thursday thinking it is Friday, just to find out that it is not. Comparable to buying a chocolate chip cookie only to find out on the first bite it is in fact a raisin cookie.
Sweet! Only two hours until the weekend!

Dude, it's not Friday.

What? Fucking raisin Thursdays.
by MrSkulled December 07, 2012