Forum:How did Smaug know Thorin's title?

Hi I am not an expert on the book or the movies but I had an itchy question after I have watched the 2nd movie and I am sorry if I am being a complete idiot by asking a question like this as I say I am kind of newbee. Anyway the question is

While Smaug was talking with Bilbo, he asked a question to Bilbo like 'where is your dwarf friend Oakenshiled' but as far as I know Smaug should have not known this title of the Thorin because this title is given the Thorin after he defeated the Azog with a sheild made by oak and this event took place after Smaug has conquered the mountain and again as far as I know Smaug was assumed to sleep or stay in that mountain until the Bilbo woke him up without a contact with outside world. So Smaug should not be aware of Thorin's title but he called him with his title. How? or am I completely wrong :D