BMSO Share definition Flag Shorthand for 'BITE MY SHIT OFF'. Used in the same manner as ROFL to express utter contempt. Ernie: I'd prefer to use the dot as ironic counterpoint, especially in this instance, but it's a bit hard to wring any irony out of this topic.Reply: BMSO BMSO by Fatt Eh July 1, 2009 0 0 Get merch Get the BMSO mug. Buy Now — $32.95 See more merch
