Vacuum guy/girl

The people you see in supermarkets that seem to think they exist in a vacuum and block the whole aisle, so transfixed by the products on the shelves.

You can sometimes pass by them after saying "excuse me" about the third time.

Guy 1: Dude, he/she sure was a vacuum guy/girl, what's so fascinating about the shampoo aisle anyway?

Guy 2: He/She sure was, he/she seemed genuinely amazed that a busy downtown store actually had other people in it.