BOI

Something you say when someone says something stupid.

Tessa: I like cats
Kacey: *Inhales* BOI

Baka

A tsundere would say this to you.
It means idiot, moron imbecile & more in japanese
the gif below shows a baka.

Natsuki: H- hey! I- it's not like I like you or anything, baka

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