A wannabe Grammar Nazi who uses incorrect grammar but fails to see the error in his/her own typing, yet always criticizes others' grammar errors. They can be characterized by the idiom: Pot calling the kettle black.
Me: "Sometimes I like to wind grammer natzis up just for the hell of it. Especially when I call them a grammer natzi. That works well."
Friend: "What a good cant".
Someone who takes every opportunity to correct someone on their grammar, even though they themselves don't know how to spell "grammar." See also hypocrite.
A grammer Natzi is somebody who feels teh need 2 correct everything you type or say.
Grammar nazi: * triggered* *grammar, *Nazi, *the, *too, also you missed a comma. *Rolls eyes
Last night I posted a story and this Grammer natzi came and corrected all my mistakes in the comments! Ugh