fassasitate Share definition Flag to fantasise about people above the age of 70. Derives from the word fasser which means old. Stop fassasitating over my grandma you big weirdo! fassasitate by esther.L and Nell.C the foxes February 18, 2005 0 0 Get merch Get the fassasitate mug. Buy Now — $32.95 See more merch