Girls! What does it mean when you give a guy a head-to-toe look?

Long story short, I was standing in front of the classroom holding a laptop and looking at the screen, while one of my classmates stood right next to me. She gave me a head-to-toe look with no facial expression whatsoever. I could see out of the corner of my eye that she was looking at me. So, what does it mean when a girl gives a guy a head-to-toe look?

P. S. Nothing is wrong with my outfit, I was wearing a hoodie and a black jeans.

Girls! What does it mean when you give a guy a head-to-toe look?
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