I have meta tag in Header like that..
<meta http-equiv='refresh' content='0;url=http://stackoverflow.com/'>
is it possible to Remove it Dynamically using jQuery ?
As far as I can see, this doesn't make any sense. The header you show is supposed to cause an immediate redirect, possibly before any JavaScript ever gets executed.
If you can use jQuery to update it, you might as well do this:
location.href = "http://new.target";
I don't know how this will be executed with the Meta tag present though - whether it will always beat the Meta tag, always lose against it, or cause inconsistent results across browsers.
Maybe tell us what exactly your situation is and why you need to do this.