blob fat Share definition Flag when someone becomes so fat that their body loses its resemblance to that of a human being and transcends into a shape that can only be described as 'blob' that lady on the scooter over there doesn't even look like a human. she is so fucking blob fat blob fat by XullioS June 8, 2009 0 0 Get merch Get the blob fat mug. Buy Now — $32.95 See more merch