Where does “burikko” come from?

burikko (English) comes from Japanese ぶりっ子, from Japanese 子, from Japanese 鼠, from Japanese nezumi.

burikko (English): An adult woman who behaves childishly, especially a Japanese woman or a woman involved with Japanese culture

Definitions

An adult woman who behaves childishly, especially a Japanese woman or a woman involved with Japanese culture

Step	Language	Word	Meaning
1	Japanese	ぶりっ子	cutie pie, a woman who performs a stylized, child-like cuteness
2	Japanese	子	a child; a girl, especially a dear or desired...
3	Japanese	鼠	a mouse or a rat; general term for members of...
4	Japanese	nezumi	—