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[sagacity]

Someone that surfs the internet forums a lot and talks a big game like they know it all or know more than they actually do and often can't back it up because they don't dive very much and/or have sub-par diving skills.  People that fit this description are often "trolls" as well. 
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What's a troll?
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From Wikipedia:
In Internet terminology, a troll is someone who comes into an established community such as an online discussion forum, and posts inflammatory, rude, repetitive or offensive messages designed intentionally to annoy and antagonize the existing members or disrupt the flow of discussion.