Biinfatuational Share definition Flag An adjective which means being romantically and/or sexually attracted to two people at the same time. The cheater explained that he hadn't stopped loving his wife, he was just Biinfatuational. Biinfatuational by Hidden name man March 16, 2017 0 0 Get merch Get the Biinfatuational mug. Buy Now — $32.95 See more merch