The opposite of disgrunted, which means unhappy with the current situation or state of affairs. So, to be gruntled means to be happy with the way things are going; not upset.
Dawn: "I'm so totally gruntled today! Not a thing out of place!" Or: "Oh happy day! Color me gruntled!"
Friend: "Yeah, I hate it when you're disgruntled!"
A state of bliss brought on by total acceptance or self and others usually, but not always, accompanied by a low pitched gutteral sound closely resembling an oink.
This is some great slop. You look really good in that mud! I am totally gruntled "Oink"!