BITMM Share definition Flag a “BITMM” is a woman who has multiple boyfriends whom all secretly hate her. Mary’s boyfriends: “We don’t even like her, Mary is just our BITMM.” BITMM by urmomisinlovewme October 28, 2022 0 0 Get merch Get the BITMM mug. Buy Now — $32.95 See more merch