FMTIBOOMFN Share definition Flag a slang term which stands for: FUCK ME TILL I BLEED OUT OF MY FUCKING NOSE Shayla: omg and what did he want u to doMe: ugh u know just FMTIBOOMFN FMTIBOOMFN by Datbitchhhhhhh May 31, 2020 0 0 Get merch Get the FMTIBOOMFN mug. Buy Now — $32.95 See more merch