What does it mean to eat, sleep and play Doudou?

This is a short joke from an interview with penguins.

A scientist went to Antarctica and met a group of penguins. He asked one of them: "What do you do every day?" The penguin said: "Eat, sleep and play Doudou." He asked another one: "What do you do every day?" The penguin also said: "Eat, sleep and play Doudou." "He asked many penguins, and they all said, "Eat, sleep, and play beans." Later, he met a little penguin, which looked very cute, and asked him, "Children, what do you do every day?" The penguin said: "Eat and sleep." The scientist was stunned, and then asked: "Why don't you hit Doudou?" The little penguin said: "Because I am Doudou."