grammarterrorist Share definition Flag Someone who misspells words on purpose as a sign of resistance against the grammarnazi's. My brother is such a grammarterrorist, he always uses text language in e-mails ! grammarterrorist by DeafBySilence November 9, 2017 0 0 Get merch Get the grammarterrorist mug. Buy Now — $32.95 See more merch