UBSM Share definition Flag Abbrevation for "Ultra Blonde Syndrome Moment". It's the moment when your brain shuts down and you can't forget or think anything sane. I'm not sure what we're even talking about. UBSM rules! UBSM by hitlerwasgay August 1, 2011 0 0 Get merch Get the UBSM mug. Buy Now — $32.95 See more merch
