dumb squish Share definition Flag Someone who makes a careless mistake or blurts out something intelligent. Someone who speaks before thinking. So johnny, I told her, "You're not FAT, you're just BIG!"Danny, that's insulting you dumb squish! dumb squish by Maxabillion09 February 22, 2010 0 0 Get merch Get the dumb squish mug. Buy Now — $32.95 See more merch