Danbooru

Collection: Reaction Faces

Reaction Faces are "...images or animated gifs of faces that are meant to portray a specific emotion in response to something that has been said or done. They are commonly used in discussion threads in a similar fashion to emoticons..." Know Your Meme

Another thing to note, it must be funny as hell.

Resembling Pixiv tags: 顔芸 (Kaogei) / Making Faces

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