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A person who likes to correct other people’s grammar and judge them by it. (this definition taken from a book review on bookriot.com) An obvious portmanteau of "grammar" AND "commando." Someone like Sheldon, of The Big Bang Theory, who is constantly on the alert for any opportunity to find a flaw in one's presentation of data/information and then bombastically inform one (and anyone else within earshot) of that flaw, right down to the tiniest misplaced comma or improper verb tense. Being an internal monologue grammando while reading or watching TV is fine, so long as it's just for your own amusement/improvement, but engaging your outer grammando during an author's book reading is likely to see you educated with a LART (Luser Attitude Readjustment Tool) by that author one of his/her/its fans.
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