This, basically means they decline and sometimes act embarassed when someone compliments her or give praise when its due. I'm not just talking about beauty, but her abilities, interests and in general personality. Its not just girls who do this too. I'm pretty sure the proper response should be a thanks and not a "No, I'm not [insert compliment/praise]".

Just last night I was texting with a girl and I simply said she has a pretty smile and she was like fuck no, before that I was talking to random girl and I praised her ability, not looks, again same reaction. Even when I congratulate a male friend of mine for the high marks he got on the exams, same fucking reaction!

I know, its not really seduction but its harder to flirt and talk to girls and in general people, not the flirting part, who do this. It kills the mood. But anyways I would love to know why they do this and how to evade situations like this.