Building "Negative Keywords" into the meta tags

Does anyone know how to build negative keywords into the meta tags?

This week, my site raised in impressions for the keyword "appliance."
This is a problem, because my site doesn't sell or repair appliances.
I'd like to be able to include a meta tag that tells search engines
not to list my site in the natural results if the word "appliance"
appears in the search.

Some people may think that this is not a problem, because traffic is
exposure, and all exposure is good. However, I also don't want to
waste people's time and I don't want to increase my bounce rate. If I
can use negative keywords in the meta tags, then I might be able to
proactively withdrawl myself from the searches of those people who are
not looking for my products and thus improve my level of service to
the internet community.

So, this brings us back to the question: How do I do it? How can I
add negative keywords to my header so that search engines will
recognize them?

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rel=nofollow vs. robot.txt's content=nofollow

it has been determined that rel=nofollow (when used internally) can
actually 'evaporate pagerank' ([URL="http://www.bruceclay.com/
newsletter/volume69/nofollowtactics.html"]reference bruceclay.com[/
URL]) They basically say that if a page is PR10 with 10 links, and 5
of them are rel=nofollow, that still only 1 point of pagerank is
passed to the 5 "do follow" links (instead of 10/5=2 points).

My question is - does anyone know if using the content=nofollow tag in
the robots.txt file does the same thing?

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does duplicate content hurt SEO & google ranking?

I'm confused by out of date information and I feel like it's a yes or
no answer- if I write an article and I post it on my blog and then
10-20 other people love what I say so much and cut and paste - does
that hurt my own rankings? Forget about copy right issues here - just
the SEO?

Does the answer change if they say "this information was originally
written by XXX" but never links to my site?

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