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.
Impostor: Hey guys, don't you know the difference between your and you're? I'm such a grammer nazi.
Sane guy: Wow, you have no idea how stupid you sound.
Sane guy: Wow, you have no idea how stupid you sound.
by stanleyhudsonftw April 10, 2009