It means about as much as comparing it to someone that always has a nervous laugh after they speak... or to people that are afraid of silence, so they talk a lot... and so on. It could just be a habit, or a nervous tick..
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It means they want you to say hi back and maybe talk to you.
Is he or she a stranger or a friend?
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if its a guy they are probably gay, if its a girl she likes you
He's interested! You have an admirer :D
I'd find it weird
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