Flirting

What does it mean when a guy hugs you from behind while your sitting down and might rest his head on yours?

OK...simple, your a girl sitting down and just reading and out of nowhere comes the guy and hugs you from behind very tight, to the point his arms are cutting your air as his arms are wrapped tightly around your neck or chest...plus he might rest his head on yours and not move for about 2 or 3 minutes or so...and get tighter if you struggle XD
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well...what does a hug truly mean?...come on...he might see you as a friend as well he might have something for you...hugs are just weird and unexpected XD
What does it mean when a guy hugs you from behind while your sitting down and might rest his head on yours?
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