Bistory Share definition Flag Ones history of ex's or previous relationships.Contraction of B History. (Bitch/Bastard) Bob: I've got a new girlfriend!Dave: Probably a tranny if your bistory is anything to go by! Bistory by ethereal.zx October 5, 2012 0 0 Get merch Get the Bistory mug. Buy Now — $32.95 See more merch