nerdario Share definition Flag a word used to describe someone who is a nerd using the Cleveland Hardcore "Ario" made famous by Pitboss 2000. Yo man, look at that skinny ass emo kid, what a straight up nerdario. nerdario by Mr. X August 22, 2004 0 0 Get merch Get the nerdario mug. Buy Now — $32.95 See more merch