There is a difference between being "stuffed (heh) and can't eat any more delicious prime rib" and "nibbling on an appetizer". One leaves you satisfied the other leaves you "Larked".
The difference is, while being 'stuffed' and not being able to eat any more prime rib, they still want that prime rib....even though they know they can't handle it.
FYI I'm the prime rib...
Round these parts, getting larked means she won't be able to walk right for a week.