When a person commits a grammar sin. Perhaps using a form of a word that is not grammatically correct, misspelling a word or the misplacement of punctuation.
Person one: Hey, how've you been?
Person two: How've ain't a word.
Person three: Both of those statements are grammarasphemous.
Person four: Yeah you guys have comiited Grammersphemy.
by BrianisTuft May 8, 2009
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