ATII stands for: And then it intensifies
When a video with a common/well known/cute video with a person/animal's face in it is edited (at the end) to make the face super distorted and scary with the same type of music in the background. It isn't called for and its usually done to annoying/famous people.
"Do you want to watch some ATII videos?"
"No, I saw my favorite YouTuber on there. I'm not risking it again."
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