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1) Someone who is completely ignorant to the fact that you know a lot more about a topic you are discussing.

2) Someone who is oblivious to the fact that everything that they say about a topic is bullshit.
1) Dude, I know so much more about this than you, stop being an Topicnoramus.

2) You clearly know nothing about this topic, don't be such a Topicnoramus.
by Tazdaswimmer May 15, 2014
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