an individual that uses poor grammar, either inadvertently or deliberately.
Bob never uses "their" and "there" properly in his emails. He's such a grammateur.
by chawalte January 24, 2010
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A new grandmother who has no idea what she's doing with regard to grandmothering. (hat tip to JCW for the definition)
Bessie was obviously a grammateur, as she used safety pins to fasten her granddaughter's diaper together even though it had adhesive straps.
by chawalte January 31, 2010
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One who provides unwarranted - and incorrect - grammar corrections.
Internet User #1: There so awesome!

Internet User #2: Their*

Internet User #3: The Grammateur Nazis have arrived!
by Lord Pitaya November 30, 2013
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Grammateur - an amateur of correct grammar. For example someone who is unable to realise the difference between "your/you're" or "there/their/they're".
David: "Did you see Sophie's Facebook post? What a grammateur!"
Joseph: "Yeah, I think she may be illiterate."
by MickyNorris91 December 21, 2012
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