Sisbliss Share definition Flag A sisbliss is a close non-sexual relationship between two (or more) women. Female equivalent of bromance. Nicole Kidman and Naomi Watts are best friends, some may say they have a sisbliss Sisbliss by Laci Fontana November 15, 2013 0 0 Get merch Get the Sisbliss mug. Buy Now — $32.95 See more merch