Raisin sack Share definition Flag Shrinkage of the scrotum due to cold temperatures. Used figuratively to describe cold weather. "Man, it's raisin sack weather out there today! Put on your winter jacket!" Raisin sack by Joe Lederhans October 8, 2013 0 0 Get merch Get the Raisin sack mug. Buy Now — $32.95 See more merch