What does it mean when a guy keep staring at you for like 5 sec from a distance?

dartmai
As I was walking some guy that was sitting down kept staring straight at me. He didn't bother looking away but he was making it known. I looked once but then I stopped looking. He stared for like 6 sec like allowing me to know and moving his head where I walked at. what does it mean guys?
What does it mean when a guy keep staring at you for like 5 sec from a distance?
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