Petoony face

The 'Petoony face' is a rather shocked facial expression similar to the one displayed by the Transcendence Cat.
The name derives from the combination of the last word of the song sung by the Transcendence Cat owner (which sounds like 'Petoony', some language version of Peony, I suppose), and the iconic expression only ever captured on camera on a cat's face in that video.

"She was so shocked she pulled a Petoony face!"