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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
 
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