I proceeded to inform her that I doubted very much if any of my American friends would have a clue what she meant by that. Just to clarify, it means she ate her fill (perhaps slightly more than her fill) in a time period spanning 11am to 1:20pm (or so). That is, spanning from MUNCH to AFUNCH. Now that I've muddied the waters, let me clarify - SHE'S FULL O' FOOD.
P.S. "Aunch" would be pronounced ORNCH...and Afunch? Well, no need to explain that one, right?