This comes from a joke, saying that a girl saw her boyfriend working overtime and sent her a loving meal with great kindness. How to eat rice and soup together, isn't it In this way, the girl tries to put the rice and soup into two lunch boxes separately. In order to distinguish which one is for the rice and which one is for the soup, she leaves a note in the lunch box when the stool means rice and the urine means soup. As a result, I don't know the joke caused by this shortening of words. It's embarrassing to eat or not to eat this rice.