diddums!

剑桥词典

something you say to show that you feel no sympathy for someone who is behaving like a child
（用于表示对行事孩子气的人不感到同情）
He called you a bad name , did he? Ah, diddums! 他骂了你，是不是？哎哟，真可笑！ 返回 diddums!