A hilarious little joke

One day. The teacher asked Xiaoming what is 2 plus 2? Xiao Ming said he didn't know! I told him to ask his parents. Xiao Ming goes to ask his mother when he gets home. Her mother said something while playing mahjong. Get out. Oh, that's like going out! Then ask dad. Dad is taking a bath. I had a good time. Oh, so it's cool! He ran to ask his sister who was reading history. Go ahead. Qin Shihuang, oh, equal to Qin Shihuang! Went to ask my brother. My brother is calling his girlfriend. Say, honey, I'll wait for you outside. Oh, I'm waiting for you, dear. I'll wait for you outside! The next day, the teacher asked Xiaoming what is 2 plus 2? Xiao Ming said. Get out. The teacher slapped him. Xiaoming said it was cool. The teacher said who taught you this. Qin Shihuang, you stand up. Xiao Ming said, honey, I'll wait for you outside.