What does it mean for a boy to go to a girl's house to eat jiaozi?

There is a joke like this: Customer: "Miss, how much is the homophonic bowl jiaozi for sleeping?" ..... People's hearts and stomachs are separated, so we should guard against people's hearts! If that's what he thinks ~ then you have to get to know him again and see if your eyes are wrong! Of course, I am an optimist, but I will try my best to persuade people! thank you ...