When you are behind a women with a terrific ass...you are staring at it....she does the unexpected(it's like they have a sixth sense or something)turns around and catches you looking, making you feel like some kind of perv.
Comes from the unexpected turn a Soviet boomer would do to try to catch a U.S. sub coming up from behind.
Wow!! Did you see the turdcutter on that chick. I was enjoying the scenery but she pulled a crazy ivan on me!!