a moment on the lips, forever on the hips

Said of food that is very tasty but very fattening. Sometimes used as warning or expression of disapproval. No chocolate cake for me, thanks. A moment on the lips, forever on the hips! Are you sure you should have a second helping of ice cream? You know what they say, a moment on the lips: forever on the hips. Have you tried this crème brûlée? Who cares about "a moment on the lips, forever on the hips" when something tastes this good!