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http://www.skepdic.com/woowoo.html

It's the non-denominational version of making stuff up while untroubled by complete lack of evidence. Also the sound effect that goes along with handwaving.

Skeptic's dictionary has a pretty good definition: http://www.skepdic.com/woowoo.html

is "woo" a well known concept? I feel like this post would be much more popular if it didn't use such an obscure word in its title

It's well-known to the people reading skepticblog.

Yes.

I had to pause a second to search my mental vocabulary database to make sure it was what I thought it was, but yeah. I wouldn't say it's the most common word used to describe the concept, but I would think that it would be well known.

aka bullshit