Spengooly Share definition Flag A person who has reached one of the highest levels of stupidity. Person 1: Your urethra is a vein in your brain right? Person 2: You are an absolute spengooly mate. Spengooly by BiloGundlach21 February 13, 2018 0 0 Get merch Get the Spengooly mug. Buy Now — $32.95 See more merch