Someone who preys on people on the internet, particularly their language skills, despite the fact the person's first language may not be english or they might even have an intellectual disability, impairment or even dyslexia. All this to boost their own ego - The worst kind of nazi.
Greg (Grammar nazi): "I believe you are mistaken! I, with my superior intellect, have discovered an error in both your writing AND your wit! You will find with ample research and a quick rifle of your nearest DICTIONARY, that the correct contraction you are seeking is they're!"
Bob (sane, normal, non-sociopathic human): 'fuk off grg"
Bob (sane, normal, non-sociopathic human): 'fuk off grg"
by Mr Gochi May 14, 2023
Get the Grammar Nazimug. An ancient communication art, no longer widely practiced, but reputed to lead to vastly greater knowledge when wielded expertly.
by zenospinoza August 19, 2019
Get the grammarmug. by NotMePlease August 28, 2020
Get the Fucking Grammarmug. 
by AcidHazard5 September 10, 2019
Get the Grammarmug. Noun; someone who pays astute attentive to grammar when writing or speaking. Grammar gestapo also place significant emphasis on parallel structure, word choice, use of imagery and figurative language in their writing.
My college essay tutor is a true grammar expert, and we jokingly refer to her as the grammar gestapo.
by BrooklynJGT December 25, 2022
Get the Grammar Gestapomug. by sdjhwer June 28, 2021
Get the The Kings vs Grammar Refmug.