I may have found an answer to my own question.... http://www.androidtablets.net/forum/samsung-galaxy-note-10-1/49812-clearing-out-trash-gmail.html
I'll let everyone know how it works out.
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The answer is: there is no spoon. (lol)
When you click on gmail app from your tablet, you're linked to a server on the internet.
In order to delete you trash (sooner that the auto 30 days), you have to log-in on a computer
to go and delete any trash.
Now I'm looking for a better app to run gmail.