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. by General butz February 6, 2018
Get the Uber grammar nazimug. When you're arguing with someone on the internet and spell one word wrong, they use that as evidence that you yourself are wrong as well.
Person 1: Well actually, it is more likely that Bush did NOT do 9/11, although their are still a few people who like to mindlessly argue.
Grammar Nazi: How am I supposed to believe anyone who spelled "there" wrong?
Grammar Nazi: How am I supposed to believe anyone who spelled "there" wrong?
by funwillfunwill August 12, 2016
Get the Grammar Nazimug. One to go beyond needed to criticize a person's writing or grammar. Could be one whom is very over reacter when someone uses grammar incorrectly or spells a simple word, or any word, incorrectly.
by Thunderbolt48 April 1, 2017
Get the Grammar Nazimug. by Just a person named john September 2, 2022
Get the Grammar-Nazimug. 
Get the Grammar Nazimug.