It's theatrical slang - you can find a (much) fuller explanation here - http://www.worldwidewords.org/qa/qa-cla1.htm
So talking claptrap is trapping a clap. Doing it just for applause. I talk claptrap all the time then. Most bloggers probably do.
trap - as in "keep your trap shut" is mouth, clap - as in "I'm going to clap you in the mouth if you give me any more of your nonsense, sonny" is er, thump or something - hence "claptrap" . . .
Mousetrap, Mantrap, VonTrapp, Cantrap, Suntrap, entrap.I could go on for hours but I won't... :)
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