There's One Possibility

Chaoge was furious!

What was wrong with these people? She and Feng Wu were here just to register for the entrance exam! Xiao Wu was so smart and brilliant that she could surpass them without breaking a sweat! Where did their sense of superiority come from? And what made them think that they could laugh at Xiao Wu like this?!

That pissed Chaoge off. She made up her mind that she would become an excellent cultivator; one day, she would be strong enough to sneer at all those people who used to laugh at Xiao Wu!

"Hahaha — just look at that butterball. She's cross. She looks so funny with her cheeks puffed up."

"Hahaha, are you seeing this? The butterball wants to kill us with her eyes."

"Oh my, I think the butterball wants to fight us to death."

By "butterball," they were obviously referring to Chaoge.

All those "butterballs" infuriated Chaoge!

No teenage girl would want such a nickname, especially one that used to be so pretty.