granny bin Share definition Flag Granny bin is like where someone dumps the oldies at so they don't have to wipe their asses anymore A nursing home or refered to as the granny bin in slang (mainly Australian or British) granny bin by Thefuckingdictionary December 30, 2014 0 0 Get merch Get the granny bin mug. Buy Now — $32.95 See more merch