Well if you wanted to use the post method you could create a hidden field and then just pass it like that, but since (as far as I understand) you want to use the GET method you could do something like
<a href="blah.php?name=blah" onMouseover="window.status = 'Blah'">Link</a>
Yes this is Javascript. but it will keep them from seeing the address when they put there mouse on a link. Now if you are asking how to omit it from the top bar where you can type in the address. I dont think you can do that with the get method.