Why is Nezha called lotus root paste?

Nezha is the youngest child of Li Jing, but he doesn't want to be a younger brother any more. He wanted to be a brother, so he jumped off a cliff and fell into a lotus root paste (meaning brother in Japanese).

This is a joke circulating on the Internet. Recently, with the release of Nezha, a film about Guo Man, everyone became interested in the characters in the play and joined in the ridicule. From Chicken Dictionary @ Lori's Strawberry Fat Age