Nobgrinder Share definition Flag A person who feels enclined to grind their penis against a hard surface whist erect. *scraping noise* "what is Mark doing mum?" "don't worry Timothy, he is just being a Nobgrinder." Nobgrinder by Flumn July 26, 2007 0 0 Get merch Get the Nobgrinder mug. Buy Now — $32.95 See more merch