wastestachio Share definition Flag When you open a pistachio nut and accidentally throw a way the nut instead of the shell. Crack.Throw a way nut instead of shell.Dammit, I just had a wastestachio. wastestachio by nutty professor July 23, 2012 0 0 Get merch Get the wastestachio mug. Buy Now — $32.95 See more merch