fuckitday Share definition Flag n. a work (or school) day that has been spontaneously converted into a day off. Tuesday,I woke up late and couldn't find my keys so I declared it a fuckitday. fuckitday by F. Rodderick Hsu May 7, 2005 0 0 Get merch Get the fuckitday mug. Buy Now — $32.95 See more merch