Girls, when you give that "coy" smile to a guy, what does it usually mean?

Anonymous
Let's say you are talking and you are both having fun, then when he says something nice about you or makes a joke, you give him that "look" and that smile that is unmistakeable that tells the guy he is doing a good job and then you look away. Does that mean you like him? Its not one of those automatic smile people give, it just feels different and "special". Am I over thinking or what us going through your head at that moment?
Girls, when you give that "coy" smile to a guy, what does it usually mean?
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