Phrase: Blowing someone off

I posted this question two months ago and didn't get a response. It is not on the search the archives of the discussion group anymore either.

This is a phrase I hear more and more in public in America. I want to know how it meaning has totally changed in the last twenty years, when you could say such a thing in public. I'm sick of hearing it.

John,

Just in case you thought censorship was at work: I checked and found that the archive search hasn't been picking up all the old messages. That's fixed now - you should be able to find your earlier messages.

Gary