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A quick comment made to save face, usually filled with nonsense and bad words, because you didn't bother to learn anything about the topic first.
"You're all wrong! I know more than you do!", said by a man who doesn't know what the internet is.
"This is the dumbest thing I've ever heard!", from someone who can't spell "internet".
"I'm not wrong! I'm just right!", said by a guy who got fired from his job last week.