obesetobeast Share definition Flag A fittness youtuber who used to be a fatass motherfucker and after losing 170 pounds is now a fucking beast. Ive noticed that guy went from obesetobeast. obesetobeast by MlgFucker69 June 21, 2016 0 0 Get merch Get the obesetobeast mug. Buy Now — $32.95 See more merch